diff --git a/backend/alembic/versions/0004_knowledge.py b/backend/alembic/versions/0004_knowledge.py
new file mode 100644
index 0000000..897bba3
--- /dev/null
+++ b/backend/alembic/versions/0004_knowledge.py
@@ -0,0 +1,118 @@
+"""M3 知识域：knowledge_doc + 扩宽 item.status（加知识四态）。
+
+三个需要注意的点：
+
+1. **item.status 的 CHECK 再扩一次**。0003 里是"任务 ∪ 工单"，知识的
+   `draft/in_review/published/archived` 会被直接拦下。这里改为三者并集；
+   "哪种 kind 只能用哪组状态"由 `app/domain/*.py` 的状态机保证，不靠数据库
+   （CHECK 不能跨行判断 kind 与 status 的组合）。
+2. **知识的来源写在数据库里**。`source_kind <> 'manual'` 时 `source_item_id` 必填。
+   这条 CHECK 是 D3 的物理落点：LLM 自动归档出来的知识若没有来源，用户无法核对，
+   等于往库里塞断言。
+3. **downgrade 会删掉所有知识**（kind='knowledge' 的 item 及其扩展），原因与 0003 相同：
+   旧约束容纳不下知识状态，不回删就回不到 0003。
+"""
+
+from __future__ import annotations
+
+from collections.abc import Sequence
+
+import sqlalchemy as sa
+from alembic import op
+from sqlalchemy.dialects import postgresql
+
+revision: str = "0004"
+down_revision: str | None = "0003"
+branch_labels: str | Sequence[str] | None = None
+depends_on: str | Sequence[str] | None = None
+
+APP_ROLE = "dadao_app"
+
+TENANT_TABLES_0004: tuple[str, ...] = ("knowledge_doc",)
+
+TASK_STATUSES = ("inbox", "todo", "doing", "done", "blocked", "canceled")
+TICKET_STATUSES = ("open", "accepted", "in_progress", "pending_verify", "done", "canceled")
+KNOWLEDGE_STATUSES = ("draft", "in_review", "published", "archived")
+
+
+def upgrade() -> None:
+    # 1) item.status 放宽到 任务 ∪ 工单 ∪ 知识
+    op.execute("ALTER TABLE item DROP CONSTRAINT IF EXISTS ck_item_status")
+    statuses = ",".join(
+        f"'{s}'" for s in (*TASK_STATUSES, *TICKET_STATUSES, *KNOWLEDGE_STATUSES)
+    )
+    op.execute(f"ALTER TABLE item ADD CONSTRAINT ck_item_status CHECK (status IN ({statuses}))")
+
+    # 2) knowledge_doc
+    op.create_table(
+        "knowledge_doc",
+        sa.Column(
+            "item_id",
+            postgresql.UUID(as_uuid=True),
+            sa.ForeignKey("item.id", ondelete="CASCADE"),
+            primary_key=True,
+        ),
+        sa.Column(
+            "workspace_id",
+            postgresql.UUID(as_uuid=True),
+            sa.ForeignKey("workspace.id", ondelete="CASCADE"),
+            nullable=False,
+        ),
+        sa.Column(
+            "author_id",
+            postgresql.UUID(as_uuid=True),
+            sa.ForeignKey("app_user.id", ondelete="RESTRICT"),
+            nullable=False,
+        ),
+        sa.Column(
+            "source_item_id",
+            postgresql.UUID(as_uuid=True),
+            sa.ForeignKey("item.id", ondelete="SET NULL"),
+            nullable=True,
+        ),
+        sa.Column("source_kind", sa.String(16), nullable=False, server_default="manual"),
+        sa.Column("doc_type", sa.String(16), nullable=False, server_default="note"),
+        sa.Column("status_hint", sa.String(16), nullable=False, server_default="draft"),
+        sa.Column("summary", sa.Text(), nullable=False, server_default=""),
+        sa.Column("generated_by", sa.String(16), nullable=False, server_default="human"),
+        sa.Column("published_at", sa.DateTime(timezone=True), nullable=True),
+        sa.Column("archived_at", sa.DateTime(timezone=True), nullable=True),
+        sa.Column("chunk_count", sa.Integer(), nullable=False, server_default="0"),
+        sa.Column(
+            "created_at", sa.DateTime(timezone=True), server_default=sa.func.now(), nullable=False
+        ),
+        sa.Column(
+            "updated_at", sa.DateTime(timezone=True), server_default=sa.func.now(), nullable=False
+        ),
+        sa.Column("version", sa.Integer(), nullable=False, server_default="1"),
+        sa.CheckConstraint(
+            "source_kind = 'manual' OR source_item_id IS NOT NULL",
+            name="ck_knowledge_source_required",
+        ),
+        sa.CheckConstraint("chunk_count >= 0", name="ck_knowledge_chunk_count"),
+    )
+    op.create_index("ix_knowledge_ws_status", "knowledge_doc", ["workspace_id", "status_hint"])
+    op.create_index("ix_knowledge_ws_source", "knowledge_doc", ["workspace_id", "source_item_id"])
+
+    # 3) RLS + 授权
+    op.execute("ALTER TABLE knowledge_doc ENABLE ROW LEVEL SECURITY")
+    op.execute(
+        "CREATE POLICY knowledge_doc_isolation ON knowledge_doc "
+        "USING (workspace_id = app_ws_id()) WITH CHECK (workspace_id = app_ws_id())"
+    )
+    op.execute(
+        f"GRANT SELECT, INSERT, UPDATE, DELETE ON {', '.join(TENANT_TABLES_0004)} TO {APP_ROLE}"
+    )
+
+
+def downgrade() -> None:
+    # 旧约束容纳不下知识状态：先清掉知识 item，才能回到 0003 的约束
+    op.execute("DELETE FROM item WHERE kind = 'knowledge'")
+    op.execute("DROP POLICY IF EXISTS knowledge_doc_isolation ON knowledge_doc")
+    op.drop_index("ix_knowledge_ws_source", table_name="knowledge_doc")
+    op.drop_index("ix_knowledge_ws_status", table_name="knowledge_doc")
+    op.drop_table("knowledge_doc")
+
+    op.execute("ALTER TABLE item DROP CONSTRAINT IF EXISTS ck_item_status")
+    statuses = ",".join(f"'{s}'" for s in (*TASK_STATUSES, *TICKET_STATUSES))
+    op.execute(f"ALTER TABLE item ADD CONSTRAINT ck_item_status CHECK (status IN ({statuses}))")
diff --git a/backend/app/api/knowledge.py b/backend/app/api/knowledge.py
new file mode 100644
index 0000000..35deaf8
--- /dev/null
+++ b/backend/app/api/knowledge.py
@@ -0,0 +1,450 @@
+"""知识域接口（M3）：草稿、审议、发布、归档，以及"从事项沉淀"。
+
+一条知识的一生：
+
+    工单验收通过（或你手动点"沉淀成知识"）
+      -> draft      草稿：系统整理好了，等你核对
+      -> in_review  提交审议：让同事看一遍（可选）
+      -> published  发布：进团队检索、能被问答引用
+      -> archived   归档：不删，退出检索（历史结论不该消失）
+
+为什么要 `draft` 这一步：自动整理的东西一定有"看着像那么回事、其实漏了前提"的情况，
+让人扫一眼的成本远低于让整个团队按错的结论办事。发布权收紧到 owner/admin 也是同理——
+发布等于团队背书。
+"""
+
+from __future__ import annotations
+
+import uuid
+from datetime import datetime, timezone
+from typing import Annotated, Any
+
+from fastapi import APIRouter, Query
+from pydantic import BaseModel, Field
+from sqlalchemy import Select, and_, or_, select, update
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from ..audit import record as audit_record
+from ..deps import MemberDep, SessionDep
+from ..domain.knowledge import can_publish_role, sidebar_fields, target_status
+from ..errors import AppError, ErrorCode
+from ..models_knowledge import DOC_TYPES, KNOWLEDGE_STATUSES, KnowledgeDoc
+from ..models_task import Activity, Item
+from ..schemas import clamp_limit, decode_cursor, encode_cursor, ok
+from ..serializers import item_out, tags_of
+from ..services.knowledge import create_draft_from_source, find_doc_by_source
+
+router = APIRouter(prefix="/workspaces/{ws_id}", tags=["知识库"])
+
+
+# ── 入参 ────────────────────────────────────────────────────────────────
+class KnowledgeIn(BaseModel):
+    title: str = Field(min_length=1, max_length=200)
+    body_md: str = ""
+    summary: str = Field(default="", max_length=2000)
+    doc_type: str = "note"
+    source_item_id: uuid.UUID | None = None
+    tag_names: list[str] = Field(default_factory=list)
+
+
+class KnowledgePatch(BaseModel):
+    title: str | None = Field(default=None, min_length=1, max_length=200)
+    body_md: str | None = None
+    summary: str | None = None
+    doc_type: str | None = None
+    tag_names: list[str] | None = None
+    version: int
+
+
+class StatusActionIn(BaseModel):
+    action: str
+    version: int
+    note: str = ""
+
+
+# ── 内部工具 ────────────────────────────────────────────────────────────
+async def _load_doc(
+    session: AsyncSession, ws_id: uuid.UUID, item_id: uuid.UUID
+) -> tuple[Item, KnowledgeDoc]:
+    item = await session.get(Item, item_id)
+    doc = await session.get(KnowledgeDoc, item_id)
+    if item is None or doc is None or item.workspace_id != ws_id or item.kind != "knowledge":
+        raise AppError(ErrorCode.KNOWLEDGE_NOT_FOUND, "这份知识不存在")
+    return item, doc
+
+
+async def _log(
+    session: AsyncSession, item: Item, actor_id: uuid.UUID, action: str, payload: dict | None = None
+) -> None:
+    session.add(
+        Activity(
+            workspace_id=item.workspace_id,
+            item_id=item.id,
+            actor_id=actor_id,
+            action=action,
+            payload=payload or {},
+        )
+    )
+
+
+async def _source_out(
+    session: AsyncSession, ws_id: uuid.UUID, source_item_id: uuid.UUID | None
+) -> dict[str, Any] | None:
+    if source_item_id is None:
+        return None
+    source = await session.get(Item, source_item_id)
+    if source is None or source.workspace_id != ws_id:
+        return None
+    return {
+        "id": str(source.id),
+        "kind": source.kind,
+        "title": source.title,
+        "status": source.status,
+    }
+
+
+def _doc_out(doc: KnowledgeDoc) -> dict[str, Any]:
+    return {
+        "doc_type": doc.doc_type,
+        "summary": doc.summary,
+        "status_hint": doc.status_hint,
+        "source_kind": doc.source_kind,
+        "source_item_id": str(doc.source_item_id) if doc.source_item_id else None,
+        "generated_by": doc.generated_by,
+        "published_at": doc.published_at,
+        "archived_at": doc.archived_at,
+        "chunk_count": doc.chunk_count,
+        "author_id": str(doc.author_id),
+    }
+
+
+async def _knowledge_out(
+    session: AsyncSession, ws_id: uuid.UUID, item: Item, doc: KnowledgeDoc
+) -> dict[str, Any]:
+    tags = (await tags_of(session, ws_id, [item.id])).get(item.id, [])
+    data = item_out(item, tags)
+    data["knowledge"] = _doc_out(doc)
+    data["source"] = await _source_out(session, ws_id, doc.source_item_id)
+    return data
+
+
+async def _set_tags_for(
+    session: AsyncSession, ws_id: uuid.UUID, item: Item, names: list[str]
+) -> None:
+    from .items import _set_tags
+
+    await _set_tags(session, ws_id, item, names)
+
+
+# ── 列表 / 详情 ─────────────────────────────────────────────────────────
+@router.get("/knowledge", summary="知识列表")
+async def list_knowledge(
+    ctx: MemberDep,
+    session: SessionDep,
+    status: Annotated[list[str] | None, Query()] = None,
+    doc_type: Annotated[str | None, Query()] = None,
+    source_item_id: Annotated[uuid.UUID | None, Query()] = None,
+    q: Annotated[str | None, Query(max_length=100)] = None,
+    limit: Annotated[int, Query(ge=1, le=100, description="每页条数")] = 30,
+    cursor: Annotated[str | None, Query(description="上一页返回的 next_cursor")] = None,
+) -> dict:
+    ws_id = ctx.ws_id
+    stmt: Select = (
+        select(Item, KnowledgeDoc)
+        .join(KnowledgeDoc, KnowledgeDoc.item_id == Item.id)
+        .where(Item.workspace_id == ws_id, Item.kind == "knowledge", Item.deleted_at.is_(None))
+    )
+    wanted = [s for s in (status or []) if s in KNOWLEDGE_STATUSES]
+    if wanted:
+        stmt = stmt.where(KnowledgeDoc.status_hint.in_(wanted))
+    if doc_type:
+        stmt = stmt.where(KnowledgeDoc.doc_type == doc_type)
+    if source_item_id:
+        stmt = stmt.where(KnowledgeDoc.source_item_id == source_item_id)
+    if q:
+        like = f"%{q.strip()}%"
+        stmt = stmt.where(
+            or_(Item.title.ilike(like), Item.body_md.ilike(like), KnowledgeDoc.summary.ilike(like))
+        )
+    if cursor:
+        cur = decode_cursor(cursor)
+        stmt = stmt.where(
+            or_(
+                Item.updated_at < cur.created_at,
+                and_(Item.updated_at == cur.created_at, Item.id < cur.item_id),
+            )
+        )
+
+    limit = clamp_limit(limit)
+    rows = (
+        await session.execute(
+            stmt.order_by(Item.updated_at.desc(), Item.id.desc()).limit(limit + 1)
+        )
+    ).all()
+    has_more = len(rows) > limit
+    rows = rows[:limit]
+    tag_map = await tags_of(session, ws_id, [it.id for it, _ in rows])
+
+    items = []
+    for item, doc in rows:
+        data = item_out(item, tag_map.get(item.id, []))
+        data["knowledge"] = _doc_out(doc)
+        data["source"] = await _source_out(session, ws_id, doc.source_item_id)
+        items.append(data)
+
+    next_cursor = (
+        encode_cursor(rows[-1][0].updated_at, rows[-1][0].id) if has_more and rows else None
+    )
+    return ok({"items": items, "next_cursor": next_cursor, "has_more": has_more})
+
+
+@router.get("/knowledge/{item_id}", summary="知识详情")
+async def get_knowledge(item_id: uuid.UUID, ctx: MemberDep, session: SessionDep) -> dict:
+    item, doc = await _load_doc(session, ctx.ws_id, item_id)
+    data = await _knowledge_out(session, ctx.ws_id, item, doc)
+    events = (
+        await session.execute(
+            select(Activity)
+            .where(Activity.workspace_id == ctx.ws_id, Activity.item_id == item.id)
+            .order_by(Activity.created_at.desc())
+            .limit(50)
+        )
+    ).scalars()
+    data["activities"] = [
+        {
+            "action": e.action,
+            "payload": e.payload,
+            "actor_id": str(e.actor_id) if e.actor_id else None,
+            "created_at": e.created_at,
+        }
+        for e in events
+    ]
+    return ok(data)
+
+
+# ── 创建 / 修改 ─────────────────────────────────────────────────────────
+@router.post("/knowledge", summary="新建知识（手记或引用来源）")
+async def create_knowledge(body: KnowledgeIn, ctx: MemberDep, session: SessionDep) -> dict:
+    ws_id = ctx.ws_id
+    if body.doc_type not in DOC_TYPES:
+        raise AppError(ErrorCode.VALIDATION_ERROR, f"未知的知识类型：{body.doc_type}")
+
+    source: Item | None = None
+    if body.source_item_id is not None:
+        source = await session.get(Item, body.source_item_id)
+        if source is None or source.workspace_id != ws_id or source.kind not in ("task", "ticket"):
+            raise AppError(
+                ErrorCode.KNOWLEDGE_SOURCE_REQUIRED,
+                "来源必须是与本知识同一工作区的任务或工单",
+            )
+
+    item = Item(
+        workspace_id=ws_id,
+        kind="knowledge",
+        title=body.title.strip(),
+        body_md=body.body_md,
+        status="draft",
+        creator_id=ctx.user.id,
+    )
+    session.add(item)
+    await session.flush()
+
+    doc = KnowledgeDoc(
+        item_id=item.id,
+        workspace_id=ws_id,
+        author_id=ctx.user.id,
+        source_item_id=source.id if source else None,
+        source_kind="manual" if source is None else source.kind,
+        doc_type=body.doc_type,
+        status_hint="draft",
+        summary=body.summary,
+        generated_by="human",
+    )
+    session.add(doc)
+    await session.flush()
+    await _log(session, item, ctx.user.id, "knowledge_created", {"generated_by": "human"})
+    await _set_tags_for(session, ws_id, item, body.tag_names)
+    await audit_record(
+        session,
+        workspace_id=ws_id,
+        actor_user_id=ctx.user.id,
+        action="knowledge.create",
+        target_type="item",
+        target_id=str(item.id),
+    )
+    return ok(await _knowledge_out(session, ws_id, item, doc))
+
+
+@router.patch("/knowledge/{item_id}", summary="修改知识内容")
+async def patch_knowledge(
+    item_id: uuid.UUID, body: KnowledgePatch, ctx: MemberDep, session: SessionDep
+) -> dict:
+    ws_id = ctx.ws_id
+    item, doc = await _load_doc(session, ws_id, item_id)
+    if item.status == "published":
+        raise AppError(
+            ErrorCode.KNOWLEDGE_STATUS_INVALID,
+            "已发布的知识不能直接改内容，先撤回成草稿",
+            details={"from": item.status, "allowed_actions": ["archive"]},
+        )
+    if body.doc_type is not None and body.doc_type not in DOC_TYPES:
+        raise AppError(ErrorCode.VALIDATION_ERROR, f"未知的知识类型：{body.doc_type}")
+
+    values: dict[str, Any] = {}
+    if body.title is not None:
+        values["title"] = body.title.strip()
+    if body.body_md is not None:
+        values["body_md"] = body.body_md
+    if body.summary is not None:
+        values["summary"] = body.summary
+    if body.doc_type is not None:
+        values["doc_type"] = body.doc_type
+
+    if values:
+        values["updated_at"] = datetime.now(timezone.utc)
+        result = await session.execute(
+            update(Item)
+            .where(
+                Item.id == item.id,
+                Item.workspace_id == ws_id,
+                Item.version == body.version,
+                Item.deleted_at.is_(None),
+            )
+            .values(version=Item.version + 1, **values)
+        )
+        if result.rowcount == 0:
+            await session.refresh(item)
+            raise AppError(
+                ErrorCode.VERSION_CONFLICT,
+                "这条内容刚被别人改过",
+                details={"current_version": item.version},
+            )
+        await session.refresh(item)
+    if body.doc_type is not None:
+        doc.doc_type = body.doc_type
+    if body.summary is not None:
+        doc.summary = body.summary
+    if body.tag_names is not None:
+        await _set_tags_for(session, ws_id, item, body.tag_names)
+    await session.flush()
+    return ok(await _knowledge_out(session, ws_id, item, doc))
+
+
+# ── 状态动作 ────────────────────────────────────────────────────────────
+@router.post("/knowledge/{item_id}/status", summary="提交审议 / 发布 / 归档 / 恢复")
+async def change_status(
+    item_id: uuid.UUID, body: StatusActionIn, ctx: MemberDep, session: SessionDep
+) -> dict:
+    ws_id = ctx.ws_id
+    item, doc = await _load_doc(session, ws_id, item_id)
+    to_status = target_status(body.action, item.status)
+
+    # 发布等于团队背书；归档/恢复作者自己就能做
+    if body.action == "publish" and not can_publish_role(ctx.role):
+        raise AppError(
+            ErrorCode.KNOWLEDGE_FORBIDDEN,
+            "只有管理员可以发布知识",
+            details={"role": ctx.role},
+        )
+
+    now = datetime.now(timezone.utc)
+    result = await session.execute(
+        update(Item)
+        .where(
+            Item.id == item.id,
+            Item.workspace_id == ws_id,
+            Item.version == body.version,
+            Item.deleted_at.is_(None),
+        )
+        .values(version=Item.version + 1, status=to_status, updated_at=now)
+    )
+    if result.rowcount == 0:
+        await session.refresh(item)
+        raise AppError(
+            ErrorCode.VERSION_CONFLICT,
+            "这条内容刚被别人改过",
+            details={"current_version": item.version},
+        )
+    await session.refresh(item)
+    # 发布时间/归档时间记在 knowledge_doc 上（item 只有 status）
+    doc.status_hint = to_status
+    stamps = sidebar_fields(to_status, now)
+    if "published_at" in stamps:
+        doc.published_at = stamps["published_at"]
+        doc.archived_at = None
+    if "archived_at" in stamps:
+        doc.archived_at = stamps["archived_at"]
+    await _log(
+        session,
+        item,
+        ctx.user.id,
+        "knowledge_status_changed",
+        {"action": body.action, "to": to_status, "note": body.note},
+    )
+    await audit_record(
+        session,
+        workspace_id=ws_id,
+        actor_user_id=ctx.user.id,
+        action=f"knowledge.{body.action}",
+        target_type="item",
+        target_id=str(item.id),
+        payload={"to": to_status},
+    )
+    await session.flush()
+    return ok(await _knowledge_out(session, ws_id, item, doc))
+
+
+# ── 从任务/工单沉淀 ─────────────────────────────────────────────────────
+@router.post("/items/{item_id}/knowledge", summary="把这件事沉淀成知识草稿")
+async def promote_to_knowledge(
+    item_id: uuid.UUID,
+    ctx: MemberDep,
+    session: SessionDep,
+    doc_type: Annotated[str, Query()] = "postmortem",
+) -> dict:
+    ws_id = ctx.ws_id
+    source = await session.get(Item, item_id)
+    if source is None or source.workspace_id != ws_id or source.kind not in ("task", "ticket"):
+        raise AppError(ErrorCode.ITEM_NOT_FOUND, "任务不存在")
+    if doc_type not in DOC_TYPES:
+        raise AppError(ErrorCode.VALIDATION_ERROR, f"未知的知识类型：{doc_type}")
+
+    existing = await find_doc_by_source(session, ws_id, source.id)
+    if existing is not None:
+        raise AppError(
+            ErrorCode.KNOWLEDGE_ALREADY_EXISTS,
+            "这件事已经沉淀过了",
+            details={"knowledge_id": str(existing.item_id)},
+        )
+
+    resolution = ""
+    if source.kind == "ticket":
+        from ..models_ticket import TicketExt
+
+        ext = await session.get(TicketExt, source.id)
+        if ext is not None and ext.resolution_md:
+            resolution = ext.resolution_md
+
+    doc_item, doc = await create_draft_from_source(
+        session,
+        ws_id=ws_id,
+        source=source,
+        author_id=ctx.user.id,
+        generated_by="rule" if source.kind == "ticket" else "human",
+        resolution_md=resolution,
+        doc_type=doc_type,
+    )
+    await _log(
+        session, doc_item, ctx.user.id, "knowledge_created", {"source_item_id": str(source.id)}
+    )
+    await audit_record(
+        session,
+        workspace_id=ws_id,
+        actor_user_id=ctx.user.id,
+        action="knowledge.promote",
+        target_type="item",
+        target_id=str(doc_item.id),
+        payload={"source_item_id": str(source.id)},
+    )
+    # 与"新建知识"返回同一种形状：知识本体 + source，前端不用记两套
+    return ok(await _knowledge_out(session, ws_id, doc_item, doc))
diff --git a/backend/app/api/tickets.py b/backend/app/api/tickets.py
index 4ed8d73..df6575e 100644
--- a/backend/app/api/tickets.py
+++ b/backend/app/api/tickets.py
@@ -288,6 +288,41 @@ async def promote(item_id: uuid.UUID, body: PromoteIn, ctx: MemberDep, session:
 
 
 # -- 办理/验收 ----------------------------------------------------------
+async def _draft_knowledge(
+    session: AsyncSession,
+    ctx: TenantCtx,
+    ticket: Item,
+    ext: TicketExt,
+    resolution_md: str,
+    now: datetime,
+) -> None:
+    """验收通过时自动整理一份知识草稿（M3 闭环沉淀）。
+
+    只落 draft 不发布：自动整理的东西得有人扫一眼才敢进团队检索。
+    同一张工单只沉淀一次（重复点验收、历史数据补跑都不会重复产出）。
+    """
+    from ..services.knowledge import create_draft_from_source, find_doc_by_source
+
+    if await find_doc_by_source(session, ctx.ws_id, ticket.id) is not None:
+        return
+    doc_item, _doc = await create_draft_from_source(
+        session,
+        ws_id=ctx.ws_id,
+        source=ticket,
+        author_id=ctx.user.id,
+        generated_by="rule",
+        resolution_md=resolution_md or ext.resolution_md or "",
+        doc_type="postmortem",
+    )
+    await _log(
+        session,
+        doc_item,
+        ctx.user.id,
+        "knowledge_created",
+        {"source_item_id": str(ticket.id), "generated_by": "rule"},
+    )
+
+
 async def _advance(
     ctx: TenantCtx,
     session: AsyncSession,
@@ -391,6 +426,11 @@ async def _advance(
                 body="它对应的工单已验收通过",
             )
 
+    # 验收通过 -> 顺手整理一份知识草稿（闭环沉淀）。
+    # 只落草稿不发布：自动整理的东西得有人扫一眼才敢进团队检索。
+    if action == "approve":
+        await _draft_knowledge(session, ctx, ticket, ext, resolution_md, now)
+
     await session.flush()
     return await _ticket_out(session, ctx.ws_id, ticket, ext)
 
diff --git a/backend/app/domain/knowledge.py b/backend/app/domain/knowledge.py
new file mode 100644
index 0000000..91484a9
--- /dev/null
+++ b/backend/app/domain/knowledge.py
@@ -0,0 +1,187 @@
+"""知识域状态机与"从事项生成草稿"的纯函数（M3）。
+
+为什么单独放一个模块：这两件事都是纯逻辑，不该缠在 HTTP 层或 ORM 里。
+状态机能被 5 行测试覆盖；草稿拼装能被快照测试比对。放进 API 模块就只能靠 e2e 兜。
+
+两个刻意的设计：
+
+1. **草稿默认落 `draft`，不自动发布**（用户拍板）。自动生成的东西一定会有"看着像那么回事、
+   其实漏了关键前提"的情况，人扫一眼的成本远低于让团队按错的结论办事。
+2. **草稿正文如实转述来源**，不写"建议""应该"这类推断。LLM 阶段（M4）接进来时，
+   `generated_by` 会从 `rule` 变成 `llm`，但"只转述、不改写结论"这条不变。
+"""
+
+from __future__ import annotations
+
+from datetime import datetime
+from typing import Any
+
+from ..errors import AppError, ErrorCode
+
+KNOWLEDGE_TRANSITIONS: dict[str, tuple[str, ...]] = {
+    "draft": ("in_review", "published", "archived"),
+    "in_review": ("draft", "published", "archived"),
+    "published": ("archived",),
+    "archived": ("draft",),
+}
+
+KNOWLEDGE_ACTIONS: dict[str, tuple[tuple[str, ...], str]] = {
+    # action: (允许的前置状态, 目标状态)
+    "submit_review": (("draft",), "in_review"),
+    "withdraw": (("in_review",), "draft"),
+    "publish": (("draft", "in_review"), "published"),
+    "archive": (("draft", "in_review", "published"), "archived"),
+    "restore": (("archived",), "draft"),
+}
+
+# 生成草稿时给读者的一句提示，防止有人把草稿当已确认的结论转发
+DRAFT_BANNER = "> 这份草稿由系统根据来源自动整理，**请先核对再发布**；发布后才会进入团队检索。"
+
+ACTION_LABEL: dict[str, str] = {
+    "created": "创建",
+    "status_changed": "状态变更",
+    "promoted_to_ticket": "升级成工单",
+    "ticket_created": "工单创建",
+    "ticket_accept": "受理",
+    "ticket_start": "开始办理",
+    "ticket_submit": "提交验收",
+    "ticket_approve": "验收通过",
+    "ticket_reject": "验收驳回",
+    "ticket_reassign": "改派",
+    "ticket_cancel": "取消",
+    "comment_added": "评论",
+    "knowledge_created": "沉淀为知识",
+}
+
+
+def target_status(action: str, current: str) -> str:
+    """动作 → 目标状态。非法组合抛 7003，并把"现在还能做什么"带回去。"""
+    rule = KNOWLEDGE_ACTIONS.get(action)
+    if rule is None:
+        raise AppError(
+            ErrorCode.KNOWLEDGE_STATUS_INVALID,
+            message=f"未知动作 {action}",
+            details={"action": action, "allowed_actions": sorted(KNOWLEDGE_ACTIONS)},
+        )
+    allowed_from, to_status = rule
+    if current not in allowed_from:
+        allowed_actions = [a for a, (src, _) in KNOWLEDGE_ACTIONS.items() if current in src]
+        raise AppError(
+            ErrorCode.KNOWLEDGE_STATUS_INVALID,
+            message=f"当前状态（{current}）不能{_label(action)}",
+            details={
+                "action": action,
+                "from": current,
+                "allowed_from": list(allowed_from),
+                "allowed_actions": allowed_actions,
+            },
+        )
+    return to_status
+
+
+def ensure_transition(current: str, target: str) -> None:
+    """直接改状态（不经过动作）时的校验。"""
+    if target not in KNOWLEDGE_TRANSITIONS.get(current, ()):
+        raise AppError(
+            ErrorCode.KNOWLEDGE_STATUS_INVALID,
+            message=f"不能从 {current} 直接变成 {target}",
+            details={
+                "from": current,
+                "to": target,
+                "allowed": list(KNOWLEDGE_TRANSITIONS.get(current, ())),
+            },
+        )
+
+
+def sidebar_fields(target_status: str, now: datetime) -> dict[str, Any]:
+    """状态跃迁时要顺手维护的时间戳。"""
+    if target_status == "published":
+        return {"published_at": now, "archived_at": None}
+    if target_status == "archived":
+        return {"archived_at": now}
+    return {}
+
+
+def can_publish_role(role: str) -> bool:
+    """发布是"团队背书"，guest/member 只能提交审议。"""
+    return role in ("owner", "admin")
+
+
+def _label(action: str) -> str:
+    return {
+        "submit_review": "提交审议",
+        "withdraw": "撤回审议",
+        "publish": "发布",
+        "archive": "归档",
+        "restore": "恢复",
+    }.get(action, action)
+
+
+def render_draft(
+    *,
+    source_kind: str,
+    title: str,
+    body_md: str = "",
+    resolution_md: str = "",
+    created_at: datetime | None = None,
+    closed_at: datetime | None = None,
+    people: dict[str, str] | None = None,
+    timeline: list[dict[str, Any]] | None = None,
+    comments: list[dict[str, Any]] | None = None,
+) -> str:
+    """把一件事（任务或工单）整理成知识草稿的正文。
+
+    只做"结构化的转述"：来源里有什么就写什么，没有的段落直接省略，
+    不补写"经验教训"这类需要人判断的话。
+    """
+    people = people or {}
+    out: list[str] = [DRAFT_BANNER, ""]
+
+    when = _fmt(closed_at or created_at)
+    origin = "工单" if source_kind == "ticket" else "任务"
+    out.append(f"自动沉淀自{origin}「{title}」{('，' + when + ' 结束') if when else ''}。")
+    out.append("")
+
+    if people:
+        line = "、".join(f"{k}：{v}" for k, v in people.items() if v)
+        if line:
+            out.append(f"- {line}")
+            out.append("")
+
+    out.append("## 背景")
+    out.append("")
+    out.append(
+        body_md.strip() if body_md.strip() else "（来源里没有正文，补充一句这件事要解决什么。）"
+    )
+    out.append("")
+
+    rows = [r for r in (timeline or []) if r.get("action") in ACTION_LABEL]
+    if rows:
+        out.append("## 过程")
+        out.append("")
+        for r in rows:
+            out.append(f"- {_fmt(r.get('at'))} {ACTION_LABEL[r['action']]}")
+        out.append("")
+
+    if resolution_md.strip():
+        out.append("## 结论")
+        out.append("")
+        out.append(resolution_md.strip())
+        out.append("")
+
+    said = [c for c in (comments or []) if (c.get("body") or "").strip()]
+    if said:
+        out.append("## 讨论")
+        out.append("")
+        for c in said:
+            who = c.get("author") or "某人"
+            out.append(f"- **{who}**：{c['body'].strip()}")
+        out.append("")
+
+    return "\n".join(out).rstrip() + "\n"
+
+
+def _fmt(value: Any) -> str:
+    if isinstance(value, datetime):
+        return value.strftime("%Y-%m-%d %H:%M")
+    return ""
diff --git a/backend/app/errors.py b/backend/app/errors.py
index cfd7750..6930ab2 100644
--- a/backend/app/errors.py
+++ b/backend/app/errors.py
@@ -50,6 +50,13 @@ class ErrorCode(IntEnum):
     TICKET_FORBIDDEN = 6004
     NOTIFICATION_NOT_FOUND = 6005
 
+    # 7xxx 知识域
+    KNOWLEDGE_NOT_FOUND = 7001
+    KNOWLEDGE_ALREADY_EXISTS = 7002
+    KNOWLEDGE_STATUS_INVALID = 7003
+    KNOWLEDGE_FORBIDDEN = 7004
+    KNOWLEDGE_SOURCE_REQUIRED = 7005
+
 
 # 默认 HTTP 状态：业务码自己带语义，HTTP 只是传输层
 _HTTP_STATUS: dict[ErrorCode, int] = {
@@ -83,6 +90,11 @@ _HTTP_STATUS: dict[ErrorCode, int] = {
     ErrorCode.TICKET_STATUS_INVALID: 409,
     ErrorCode.TICKET_FORBIDDEN: 403,
     ErrorCode.NOTIFICATION_NOT_FOUND: 404,
+    ErrorCode.KNOWLEDGE_NOT_FOUND: 404,
+    ErrorCode.KNOWLEDGE_ALREADY_EXISTS: 409,
+    ErrorCode.KNOWLEDGE_STATUS_INVALID: 409,
+    ErrorCode.KNOWLEDGE_FORBIDDEN: 403,
+    ErrorCode.KNOWLEDGE_SOURCE_REQUIRED: 409,
 }
 
 
diff --git a/backend/app/main.py b/backend/app/main.py
index aad1782..a191643 100644
--- a/backend/app/main.py
+++ b/backend/app/main.py
@@ -12,7 +12,7 @@ from fastapi.responses import JSONResponse
 from sqlalchemy import text
 from starlette.exceptions import HTTPException as StarletteHTTPException
 
-from .api import auth, items, tickets, workspaces
+from .api import auth, items, knowledge, tickets, workspaces
 from .config import get_settings
 from .db import SessionFactory, current_app_role, engine
 from .errors import AppError, ErrorCode, http_status_for
@@ -104,6 +104,7 @@ app.include_router(items.router, prefix=settings.api_prefix)
 app.include_router(items.tag_router, prefix=settings.api_prefix)
 app.include_router(tickets.router, prefix=settings.api_prefix)
 app.include_router(tickets.notify_router, prefix=settings.api_prefix)
+app.include_router(knowledge.router, prefix=settings.api_prefix)
 
 
 @app.get("/health", tags=["运维"], summary="存活探针")
diff --git a/backend/app/models.py b/backend/app/models.py
index 81949e9..598c9ec 100644
--- a/backend/app/models.py
+++ b/backend/app/models.py
@@ -135,6 +135,7 @@ class AuditLog(Base):
 #
 # 任务域的表在 models_task.py、工单域在 models_ticket.py —— 它们 import 本模块的 Base，
 # 所以只能在文件末尾反向 import，否则循环导入。
+from .models_knowledge import KNOWLEDGE_TENANT_TABLES  # noqa: E402
 from .models_task import TASK_TENANT_TABLES  # noqa: E402
 from .models_ticket import TICKET_TENANT_TABLES  # noqa: E402
 
@@ -145,4 +146,5 @@ TENANT_TABLES: tuple[str, ...] = (
     "audit_log",
     *TASK_TENANT_TABLES,
     *TICKET_TENANT_TABLES,
+    *KNOWLEDGE_TENANT_TABLES,
 )
diff --git a/backend/app/models_knowledge.py b/backend/app/models_knowledge.py
new file mode 100644
index 0000000..3e11572
--- /dev/null
+++ b/backend/app/models_knowledge.py
@@ -0,0 +1,79 @@
+"""知识域模型（M3）：knowledge_doc。
+
+三条设计约束（对应 PRODUCT-PLAN 的 D1/D3）：
+
+1. **知识也是 `item`**。标题、正文、标签、评论、事件流全部复用；`knowledge_doc`
+   只补"从哪来的、是什么类型、什么时候被人认可过"。同一套列表、搜索、详情、权限对知识依然成立。
+2. **知识必须有来源**（D3）。`source_kind` 为 `task` / `ticket` 时必须给出 `source_item_id`，
+   只有 `manual`（自己记的笔记）允许留空。这条写在数据库 CHECK 里，不靠 API 自律——
+   将来接 LLM 自动归档时，没有来源的知识等于"没人能核对的断言"，比没有更糟。
+3. **状态机是 `draft → in_review → published → archived`**。草稿可以随时改，发布的要有
+   人来点头（`published_at` 记时间），归档的不删只藏（历史结论不该消失，只该退出检索）。
+"""
+
+from __future__ import annotations
+
+import uuid
+from datetime import datetime
+
+from sqlalchemy import (
+    CheckConstraint,
+    DateTime,
+    ForeignKey,
+    Index,
+    String,
+    Text,
+)
+from sqlalchemy.dialects.postgresql import UUID as PgUUID
+from sqlalchemy.orm import Mapped, mapped_column
+
+from .models import Base, Timestamps
+
+# 知识状态机（与任务/工单共用 item.status 一列，取值集合不同）
+KNOWLEDGE_STATUSES: tuple[str, ...] = ("draft", "in_review", "published", "archived")
+
+DOC_TYPES: tuple[str, ...] = ("note", "howto", "faq", "postmortem", "decision")
+SOURCE_KINDS: tuple[str, ...] = ("manual", "task", "ticket")
+GENERATED_BY: tuple[str, ...] = ("human", "rule")
+
+
+class KnowledgeDoc(Base, Timestamps):
+    """知识的附加信息，与 item 一比一。"""
+
+    __tablename__ = "knowledge_doc"
+    __table_args__ = (
+        Index("ix_knowledge_ws_status", "workspace_id", "status_hint"),
+        Index("ix_knowledge_ws_source", "workspace_id", "source_item_id"),
+        CheckConstraint(
+            "source_kind = 'manual' OR source_item_id IS NOT NULL",
+            name="ck_knowledge_source_required",
+        ),
+        CheckConstraint("chunk_count >= 0", name="ck_knowledge_chunk_count"),
+    )
+
+    # item_id 既是主键又是外键：一条 item 最多一条 knowledge_doc，天然 1:1
+    item_id: Mapped[uuid.UUID] = mapped_column(
+        PgUUID(as_uuid=True), ForeignKey("item.id", ondelete="CASCADE"), primary_key=True
+    )
+    workspace_id: Mapped[uuid.UUID] = mapped_column(
+        PgUUID(as_uuid=True), ForeignKey("workspace.id", ondelete="CASCADE"), nullable=False
+    )
+    author_id: Mapped[uuid.UUID] = mapped_column(
+        PgUUID(as_uuid=True), ForeignKey("app_user.id", ondelete="RESTRICT"), nullable=False
+    )
+    # 知识的来源。NULL 只允许出现在 source_kind='manual' 上（见 CHECK）
+    source_item_id: Mapped[uuid.UUID | None] = mapped_column(
+        PgUUID(as_uuid=True), ForeignKey("item.id", ondelete="SET NULL")
+    )
+    source_kind: Mapped[str] = mapped_column(String(16), nullable=False, default="manual")
+    doc_type: Mapped[str] = mapped_column(String(16), nullable=False, default="note")
+    # 冗余一份状态：列表页要按知识自己的口径筛，不想每次都回 item 表
+    status_hint: Mapped[str] = mapped_column(String(16), nullable=False, default="draft")
+    summary: Mapped[str] = mapped_column(Text, nullable=False, default="")
+    generated_by: Mapped[str] = mapped_column(String(16), nullable=False, default="human")
+    published_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True))
+    archived_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True))
+    chunk_count: Mapped[int] = mapped_column(nullable=False, default=0)
+
+
+KNOWLEDGE_TENANT_TABLES: tuple[str, ...] = ("knowledge_doc",)
diff --git a/backend/app/services/__init__.py b/backend/app/services/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/backend/app/services/knowledge.py b/backend/app/services/knowledge.py
new file mode 100644
index 0000000..c7c3830
--- /dev/null
+++ b/backend/app/services/knowledge.py
@@ -0,0 +1,136 @@
+"""知识域的数据库配套动作（M3）。
+
+放在 services 而不是 api：两个入口都要用——用户手动点"沉淀成知识"，
+以及工单验收通过时自动落一份草稿。逻辑只有一份，行为才不会分叉。
+"""
+
+from __future__ import annotations
+
+import uuid
+from typing import Any
+
+from sqlalchemy import select
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from ..domain.knowledge import render_draft
+from ..errors import AppError, ErrorCode
+from ..models import AppUser
+from ..models_knowledge import KnowledgeDoc
+from ..models_task import Activity, Comment, Item
+
+
+async def snapshot_source(session: AsyncSession, ws_id: uuid.UUID, item: Item) -> dict[str, Any]:
+    """把来源事项的"人、时间线、讨论"取成一份快照，供 render_draft 使用。"""
+    nicknames = dict(
+        (await session.execute(select(AppUser.id, AppUser.nickname))).all()  # type: ignore[arg-type]
+    )
+    timeline = (
+        await session.execute(
+            select(Activity.action, Activity.created_at)
+            .where(Activity.workspace_id == ws_id, Activity.item_id == item.id)
+            .order_by(Activity.created_at)
+        )
+    ).all()
+    comments = (
+        await session.execute(
+            select(Comment.body_md, Comment.author_id, Comment.created_at)
+            .where(
+                Comment.workspace_id == ws_id,
+                Comment.item_id == item.id,
+                Comment.deleted_at.is_(None),
+            )
+            .order_by(Comment.created_at)
+        )
+    ).all()
+    return {
+        "people": {
+            "提出人": nicknames.get(item.creator_id, ""),
+            "办理人": nicknames.get(item.assignee_id, "") if item.assignee_id else "",
+        },
+        "timeline": [{"action": a, "at": at} for a, at in timeline],
+        "comments": [
+            {"body": body, "author": nicknames.get(author_id, ""), "at": at}
+            for body, author_id, at in comments
+        ],
+    }
+
+
+async def find_doc_by_source(
+    session: AsyncSession, ws_id: uuid.UUID, source_item_id: uuid.UUID
+) -> KnowledgeDoc | None:
+    return (
+        await session.execute(
+            select(KnowledgeDoc).where(
+                KnowledgeDoc.workspace_id == ws_id,
+                KnowledgeDoc.source_item_id == source_item_id,
+            )
+        )
+    ).scalar_one_or_none()
+
+
+async def create_draft_from_source(
+    session: AsyncSession,
+    *,
+    ws_id: uuid.UUID,
+    source: Item,
+    author_id: uuid.UUID,
+    generated_by: str = "rule",
+    resolution_md: str = "",
+    doc_type: str = "note",
+    title: str | None = None,
+) -> tuple[Item, KnowledgeDoc]:
+    """从一条任务/工单生成知识草稿（draft）。同一个来源只沉淀一次。"""
+    existing = await find_doc_by_source(session, ws_id, source.id)
+    if existing is not None:
+        raise AppError(
+            ErrorCode.KNOWLEDGE_ALREADY_EXISTS,
+            message="这件事已经沉淀过一份知识了",
+            details={"knowledge_id": str(existing.item_id)},
+        )
+
+    snap = await snapshot_source(session, ws_id, source)
+    body = render_draft(
+        source_kind=source.kind,
+        title=source.title,
+        body_md=source.body_md,
+        resolution_md=resolution_md,
+        created_at=source.created_at,
+        closed_at=source.completed_at,
+        people=snap["people"],
+        timeline=snap["timeline"],
+        comments=snap["comments"],
+    )
+
+    doc_item = Item(
+        workspace_id=ws_id,
+        kind="knowledge",
+        title=title or source.title,
+        body_md=body,
+        status="draft",
+        priority=0,
+        creator_id=author_id,
+    )
+    session.add(doc_item)
+    await session.flush()
+
+    doc = KnowledgeDoc(
+        item_id=doc_item.id,
+        workspace_id=ws_id,
+        author_id=author_id,
+        source_item_id=source.id,
+        source_kind="ticket" if source.kind == "ticket" else "task",
+        doc_type=doc_type,
+        status_hint="draft",
+        summary=_first_line(resolution_md) or source.title,
+        generated_by=generated_by,
+    )
+    session.add(doc)
+    await session.flush()
+    return doc_item, doc
+
+
+def _first_line(text: str) -> str:
+    for line in text.strip().splitlines():
+        if line.strip():
+            return line.strip()[:200]
+    return ""
diff --git a/backend/tests/test_knowledge.py b/backend/tests/test_knowledge.py
new file mode 100644
index 0000000..230f157
--- /dev/null
+++ b/backend/tests/test_knowledge.py
@@ -0,0 +1,342 @@
+"""M3 知识域测试：草稿、来源、审议发布、隔离。
+
+重点不是"接口能通"，而是这几条容易做错的：
+
+1. **知识的来源不可丢**：从工单沉淀出来的知识必须指回那张工单（`source_kind='ticket'`），
+   否则半年后没人能核对这条结论从哪来；
+2. **自动沉淀只落草稿**：验收通过后知识是 `draft`，不是 `published`；
+3. **同一件事只沉淀一次**：重复点"沉淀成知识"要报 7002，而不是悄悄生成两份；
+4. **发布要管理员**：普通成员的发布请求必须是 403（7004）；
+5. **跨租户不可见**：别人的知识列表为空、直接按 id 取是 7001。
+"""
+
+from __future__ import annotations
+
+from typing import Any
+
+import pytest
+from httpx import AsyncClient
+
+from .conftest import create_workspace, login, unwrap
+
+V1 = "/api/v1"
+
+
+async def _member(
+    client: AsyncClient, owner: dict[str, Any], ws: dict[str, Any], role: str = "member"
+) -> dict[str, Any]:
+    user = await login(client)
+    inv = unwrap(
+        await client.post(
+            f"{V1}/workspaces/{ws['id']}/invitations", json={"role": role}, headers=owner["headers"]
+        )
+    )
+    unwrap(
+        await client.post(
+            f"{V1}/workspaces/{ws['id']}/join", json={"code": inv["code"]}, headers=user["headers"]
+        )
+    )
+    return user
+
+
+async def _task(client: AsyncClient, user: dict[str, Any], ws_id: str, title: str) -> dict:
+    return unwrap(
+        await client.post(
+            f"{V1}/workspaces/{ws_id}/items",
+            json={"title": title, "status": "todo"},
+            headers=user["headers"],
+        )
+    )
+
+
+async def _finish_ticket(
+    client: AsyncClient, owner: dict[str, Any], ws_id: str, helper: dict[str, Any], task: dict
+) -> dict:
+    """把任务升级成工单并走完到验收通过，返回工单。"""
+    ticket = unwrap(
+        await client.post(
+            f"{V1}/workspaces/{ws_id}/items/{task['id']}/promote",
+            json={"assignee_id": helper["user_id"]},
+            headers=owner["headers"],
+        )
+    )["ticket"]
+    await client.post(
+        f"{V1}/workspaces/{ws_id}/items/{ticket['id']}/ticket/accept", headers=helper["headers"]
+    )
+    await client.post(
+        f"{V1}/workspaces/{ws_id}/items/{ticket['id']}/ticket/start", headers=helper["headers"]
+    )
+    unwrap(
+        await client.post(
+            f"{V1}/workspaces/{ws_id}/items/{ticket['id']}/ticket/submit",
+            json={"note": "已经开了只读账号"},
+            headers=helper["headers"],
+        )
+    )
+    unwrap(
+        await client.post(
+            f"{V1}/workspaces/{ws_id}/items/{ticket['id']}/ticket/verify",
+            json={"approve": True, "resolution_md": "账号权限已开通，走的是 A 方案"},
+            headers=owner["headers"],
+        )
+    )
+    return ticket
+
+
+@pytest.mark.asyncio
+async def test_create_manual_knowledge_is_draft(client: AsyncClient) -> None:
+    owner = await login(client)
+    ws = await create_workspace(client, owner, "知识手记")
+
+    data = unwrap(
+        await client.post(
+            f"{V1}/workspaces/{ws['id']}/knowledge",
+            json={
+                "title": "报销单要贴发票原件",
+                "body_md": "财务只认纸质发票，扫描件不行。",
+                "doc_type": "note",
+                "tag_names": ["财务"],
+            },
+            headers=owner["headers"],
+        )
+    )
+    assert data["kind"] == "knowledge"
+    assert data["status"] == "draft"
+    assert data["knowledge"]["source_kind"] == "manual"
+    assert data["knowledge"]["source_item_id"] is None
+    assert [t["name"] for t in data["tags"]] == ["财务"]
+
+    listed = unwrap(
+        await client.get(f"{V1}/workspaces/{ws['id']}/knowledge", headers=owner["headers"])
+    )
+    assert [i["id"] for i in listed["items"]] == [data["id"]]
+
+
+@pytest.mark.asyncio
+async def test_ticket_approval_creates_draft_with_source(client: AsyncClient) -> None:
+    owner = await login(client)
+    ws = await create_workspace(client, owner, "闭环沉淀")
+    helper = await _member(client, owner, ws)
+    task = await _task(client, owner, ws["id"], "开通测试账号权限")
+    ticket = await _finish_ticket(client, owner, ws["id"], helper, task)
+
+    listed = unwrap(
+        await client.get(
+            f"{V1}/workspaces/{ws['id']}/knowledge",
+            params={"status": "draft"},
+            headers=owner["headers"],
+        )
+    )
+    assert listed["has_more"] is False
+    docs = [i for i in listed["items"] if i["knowledge"]["source_item_id"] == ticket["id"]]
+    assert len(docs) == 1, "验收通过应当恰好沉淀一份草稿"
+    doc = docs[0]
+    assert doc["status"] == "draft", "自动沉淀只能是草稿，不能直接发布"
+    assert doc["knowledge"]["source_kind"] == "ticket"
+    assert doc["knowledge"]["generated_by"] == "rule"
+    # 草稿正文必须带结论和"请先核对"的提示，否则用户会把它当已确认结论转发
+    assert "账号权限已开通" in doc["body_md"]
+    assert "请先核对再发布" in doc["body_md"]
+    assert doc["source"]["kind"] == "ticket"
+
+
+@pytest.mark.asyncio
+async def test_promote_twice_conflicts(client: AsyncClient) -> None:
+    owner = await login(client)
+    ws = await create_workspace(client, owner, "重复沉淀")
+    task = await _task(client, owner, ws["id"], "写周报")
+
+    first = unwrap(
+        await client.post(
+            f"{V1}/workspaces/{ws['id']}/items/{task['id']}/knowledge",
+            headers=owner["headers"],
+        )
+    )
+    assert first["knowledge"]["source_kind"] == "task"
+    assert first["knowledge"]["generated_by"] == "human"
+
+    resp = await client.post(
+        f"{V1}/workspaces/{ws['id']}/items/{task['id']}/knowledge", headers=owner["headers"]
+    )
+    assert resp.json()["code"] == 7002
+
+
+@pytest.mark.asyncio
+async def test_publish_requires_admin(client: AsyncClient) -> None:
+    owner = await login(client)
+    ws = await create_workspace(client, owner, "发布权限")
+    member = await _member(client, owner, ws)
+    doc = unwrap(
+        await client.post(
+            f"{V1}/workspaces/{ws['id']}/knowledge",
+            json={"title": "值班手册", "body_md": "先重启再上报。"},
+            headers=member["headers"],
+        )
+    )
+
+    reviewed = unwrap(
+        await client.post(
+            f"{V1}/workspaces/{ws['id']}/knowledge/{doc['id']}/status",
+            json={"action": "submit_review", "version": doc["version"]},
+            headers=member["headers"],
+        )
+    )
+    assert reviewed["status"] == "in_review"
+
+    denied = await client.post(
+        f"{V1}/workspaces/{ws['id']}/knowledge/{doc['id']}/status",
+        json={"action": "publish", "version": reviewed["version"]},
+        headers=member["headers"],
+    )
+    assert denied.json()["code"] == 7004
+
+    published = unwrap(
+        await client.post(
+            f"{V1}/workspaces/{ws['id']}/knowledge/{doc['id']}/status",
+            json={"action": "publish", "version": reviewed["version"]},
+            headers=owner["headers"],
+        )
+    )
+    assert published["status"] == "published"
+    assert published["knowledge"]["published_at"] is not None
+
+    # 已发布的内容不许直接改，先撤回
+    blocked = await client.patch(
+        f"{V1}/workspaces/{ws['id']}/knowledge/{doc['id']}",
+        json={"title": "值班手册 v2", "version": published["version"]},
+        headers=owner["headers"],
+    )
+    assert blocked.json()["code"] == 7003
+
+    archived = unwrap(
+        await client.post(
+            f"{V1}/workspaces/{ws['id']}/knowledge/{doc['id']}/status",
+            json={"action": "archive", "version": published["version"]},
+            headers=owner["headers"],
+        )
+    )
+    assert archived["status"] == "archived"
+    assert archived["knowledge"]["archived_at"] is not None
+
+
+@pytest.mark.asyncio
+async def test_illegal_action_reports_allowed(client: AsyncClient) -> None:
+    owner = await login(client)
+    ws = await create_workspace(client, owner, "非法动作")
+    doc = unwrap(
+        await client.post(
+            f"{V1}/workspaces/{ws['id']}/knowledge",
+            json={"title": "草稿"},
+            headers=owner["headers"],
+        )
+    )
+    unwrap(
+        await client.post(
+            f"{V1}/workspaces/{ws['id']}/knowledge/{doc['id']}/status",
+            json={"action": "archive", "version": doc["version"]},
+            headers=owner["headers"],
+        )
+    )
+    resp = await client.post(
+        f"{V1}/workspaces/{ws['id']}/knowledge/{doc['id']}/status",
+        json={"action": "publish", "version": doc["version"]},
+        headers=owner["headers"],
+    )
+    body = resp.json()
+    assert body["code"] == 7003
+    assert body["data"]["allowed_from"] == ["draft", "in_review"]
+    assert "restore" in body["data"]["allowed_actions"]
+
+
+@pytest.mark.asyncio
+async def test_knowledge_is_tenant_scoped(client: AsyncClient) -> None:
+    alice = await login(client)
+    ws_a = await create_workspace(client, alice, "A 的知识")
+    doc = unwrap(
+        await client.post(
+            f"{V1}/workspaces/{ws_a['id']}/knowledge",
+            json={"title": "A 的内部结论"},
+            headers=alice["headers"],
+        )
+    )
+
+    bob = await login(client)
+    ws_b = await create_workspace(client, bob, "B 的工作区")
+
+    listed = unwrap(
+        await client.get(f"{V1}/workspaces/{ws_b['id']}/knowledge", headers=bob["headers"])
+    )
+    assert listed["items"] == []
+
+    cross = await client.get(
+        f"{V1}/workspaces/{ws_b['id']}/knowledge/{doc['id']}", headers=bob["headers"]
+    )
+    assert cross.json()["code"] == 7001
+
+    not_member = await client.get(f"{V1}/workspaces/{ws_a['id']}/knowledge", headers=bob["headers"])
+    assert not_member.json()["code"] == 3003
+
+
+@pytest.mark.asyncio
+async def test_search_and_filters(client: AsyncClient) -> None:
+    owner = await login(client)
+    ws = await create_workspace(client, owner, "检索")
+    for title, doc_type in (
+        ("周报模板", "howto"),
+        ("客户投诉复盘", "postmortem"),
+        ("周报提醒", "note"),
+    ):
+        unwrap(
+            await client.post(
+                f"{V1}/workspaces/{ws['id']}/knowledge",
+                json={"title": title, "body_md": f"{title} 的正文", "doc_type": doc_type},
+                headers=owner["headers"],
+            )
+        )
+
+    hit = unwrap(
+        await client.get(
+            f"{V1}/workspaces/{ws['id']}/knowledge",
+            params={"q": "周报"},
+            headers=owner["headers"],
+        )
+    )
+    assert sorted(i["title"] for i in hit["items"]) == ["周报提醒", "周报模板"]
+
+    by_type = unwrap(
+        await client.get(
+            f"{V1}/workspaces/{ws['id']}/knowledge",
+            params={"doc_type": "postmortem"},
+            headers=owner["headers"],
+        )
+    )
+    assert [i["title"] for i in by_type["items"]] == ["客户投诉复盘"]
+
+
+@pytest.mark.asyncio
+async def test_patch_uses_optimistic_lock(client: AsyncClient) -> None:
+    owner = await login(client)
+    ws = await create_workspace(client, owner, "并发改")
+    doc = unwrap(
+        await client.post(
+            f"{V1}/workspaces/{ws['id']}/knowledge",
+            json={"title": "初稿", "version": 0},
+            headers=owner["headers"],
+        )
+    )
+    updated = unwrap(
+        await client.patch(
+            f"{V1}/workspaces/{ws['id']}/knowledge/{doc['id']}",
+            json={"body_md": "补一段", "version": doc["version"]},
+            headers=owner["headers"],
+        )
+    )
+    assert updated["version"] == doc["version"] + 1
+
+    stale = await client.patch(
+        f"{V1}/workspaces/{ws['id']}/knowledge/{doc['id']}",
+        json={"body_md": "又一段", "version": doc["version"]},
+        headers=owner["headers"],
+    )
+    assert stale.json()["code"] == 4009
+    assert stale.json()["data"]["current_version"] == updated["version"]
diff --git a/web/e2e/knowledge.mjs b/web/e2e/knowledge.mjs
new file mode 100644
index 0000000..521b466
--- /dev/null
+++ b/web/e2e/knowledge.mjs
@@ -0,0 +1,135 @@
+/**
+ * 知识闭环 e2e：一件事 → 知识草稿 → 核对 → 发布。
+ *
+ * 走的是真实浏览器 + 真实后端（8100）。前面造数据用接口，
+ * 后面验证界面，这样脚本短、失败点也清楚。
+ */
+import { chromium } from "playwright-core";
+
+const WEB = process.env.WEB ?? "http://127.0.0.1:5180";
+const API = process.env.API ?? "http://127.0.0.1:8100/api/v1";
+const stamp = String(Date.now()).slice(-7);
+const phone = `135${stamp}0`;
+
+let failures = 0;
+function check(name, ok, extra = "") {
+  console.log(`${ok ? "PASS" : "FAIL"} ${name}${extra ? ` — ${extra}` : ""}`);
+  if (!ok) failures += 1;
+}
+
+async function call(method, path, body, token) {
+  const res = await fetch(`${API}${path}`, {
+    method,
+    headers: {
+      "content-type": "application/json",
+      ...(token ? { authorization: `Bearer ${token}` } : {}),
+      ...(method === "GET" ? {} : { "idempotency-key": `e2e-${Math.random()}` }),
+    },
+    body: body ? JSON.stringify(body) : undefined,
+  });
+  const text = await res.text();
+  const json = text ? JSON.parse(text) : {};
+  if (json.code !== 0) throw new Error(`${method} ${path} -> ${json.code} ${json.message}`);
+  return json.data;
+}
+
+const browser = await chromium.launch({
+  executablePath:
+    process.env.CHROME ??
+    `${process.env.LOCALAPPDATA}\\ms-playwright\\chromium-1223\\chrome-win64\\chrome.exe`,
+});
+const consoleErrors = [];
+const context = await browser.newContext({ viewport: { width: 1280, height: 900 } });
+const page = await context.newPage();
+page.on("console", (m) => {
+  if (m.type() === "error") consoleErrors.push(m.text());
+});
+page.on("response", (r) => {
+  if (r.status() >= 400) consoleErrors.push(`${r.status()} ${r.url()}`);
+});
+
+try {
+  await call("POST", "/auth/sms/send", { phone });
+  const login = await call("POST", "/auth/login", { phone, code: "123456" });
+  const token = login.tokens.access_token;
+  const ws = await call("POST", "/workspaces", { name: `知识闭环 ${stamp}` }, token);
+  const task = await call(
+    "POST",
+    `/workspaces/${ws.id}/items`,
+    { title: "发票原件必须一起寄", body_md: "电子发票打印件不算，财务退回过一次。" },
+    token,
+  );
+  const moved = await call(
+    "POST",
+    `/workspaces/${ws.id}/items/${task.id}/status`,
+    { status: "todo", version: task.version },
+    token,
+  );
+  await call(
+    "POST",
+    `/workspaces/${ws.id}/items/${task.id}/status`,
+    { status: "done", version: moved.version },
+    token,
+  );
+
+  await page.addInitScript(
+    ([access, refresh]) => {
+      localStorage.setItem("dadao.access", access);
+      localStorage.setItem("dadao.refresh", refresh);
+    },
+    [token, login.tokens.refresh_token],
+  );
+  await page.goto(`${WEB}/w/${ws.id}`, { waitUntil: "networkidle" });
+  await page.getByRole("button", { name: "已完成", exact: true }).click();
+  await page.getByText("发票原件必须一起寄", { exact: false }).first().click();
+  await page.getByRole("button", { name: "沉淀成知识", exact: true }).click();
+  await page.getByText("已生成知识草稿", { exact: false }).waitFor({ timeout: 10_000 });
+  check("任务详情能把这件事沉淀成草稿", true);
+
+  await page.getByRole("button", { name: "关闭", exact: true }).click();
+
+  await page.getByRole("link", { name: "知识", exact: true }).click();
+  const card = page.getByText("发票原件必须一起寄", { exact: false }).first();
+  await card.waitFor({ timeout: 10_000 });
+  const draftLabelVisible = await page.getByText("草稿", { exact: true }).first().isVisible();
+  check("草稿出现在「待核对」", draftLabelVisible);
+  await page.screenshot({ path: "e2e/artifacts/knowledge-draft.png", fullPage: false });
+
+  await page.getByRole("button", { name: "打开", exact: true }).first().click();
+  // 等这一个请求落地再断言，不然会和抽屉的刷新抢跑（"已发布"这四个字在 tab 上也有一份）
+  const [publishResp] = await Promise.all([
+    page.waitForResponse(
+      (r) => r.url().includes("/knowledge/") && r.url().endsWith("/status") && r.status() === 200,
+    ),
+    page.getByRole("button", { name: "发布", exact: true }).click(),
+  ]);
+  check("发布请求成功", publishResp.ok());
+  await page.getByText(/已发布 · 版本 \d+/, { exact: false }).waitFor({ timeout: 10_000 });
+  const published = await page.getByText(/已发布 · 版本 \d+/, { exact: false }).first().isVisible();
+  check("核对后可以发布", published);
+
+  const again = await fetch(`${API}/workspaces/${ws.id}/knowledge`, {
+    headers: { authorization: `Bearer ${token}` },
+  }).then((r) => r.json());
+  // 同标题可能有多条（每次跑脚本都会新建工作区，但标题固定在两处），取已发布的那条
+  const doc = again.data.items.find(
+    (d) => d.title === "发票原件必须一起寄" && d.knowledge.status_hint === "published",
+  );
+  check(
+    "发布后接口里 published 且有发布时间",
+    doc?.knowledge.status_hint === "published" && Boolean(doc?.knowledge.published_at),
+  );
+  check("正文带「请先核对再发布」的提示", String(doc?.body_md ?? "").includes("请先核对再发布"));
+  await page.screenshot({ path: "e2e/artifacts/knowledge-published.png", fullPage: false });
+
+  check("浏览器控制台与网络无报错", consoleErrors.length === 0, consoleErrors.slice(0, 3).join(" | "));
+} catch (err) {
+  failures += 1;
+  console.log(`FAIL 脚本异常 — ${err.message}`);
+  await page.screenshot({ path: "e2e/artifacts/knowledge-failure.png" }).catch(() => {});
+  console.log((await page.textContent("body"))?.slice(0, 600));
+} finally {
+  await browser.close();
+  console.log(failures === 0 ? "\nALL PASS" : `\n${failures} FAILED`);
+  process.exit(failures === 0 ? 0 : 1);
+}
diff --git a/web/src/App.tsx b/web/src/App.tsx
index 3521977..60b5dd6 100644
--- a/web/src/App.tsx
+++ b/web/src/App.tsx
@@ -8,6 +8,7 @@ import { WorkspacePage } from "./pages/Workspace";
 import { TasksPage } from "./pages/Tasks";
 import { BoardPage } from "./pages/Board";
 import { TicketsPage } from "./pages/Tickets";
+import { KnowledgePage } from "./pages/Knowledge";
 import { JoinPage } from "./pages/Join";
 
 interface AuthState {
@@ -86,6 +87,7 @@ export function App() {
         <Route path="/w/:wsId" element={<TasksPage />} />
         <Route path="/w/:wsId/board" element={<BoardPage />} />
         <Route path="/w/:wsId/tickets" element={<TicketsPage />} />
+        <Route path="/w/:wsId/knowledge" element={<KnowledgePage />} />
         <Route path="/w/:wsId/members" element={<WorkspacePage />} />
         <Route path="/join/:wsId/:code" element={<JoinPage />} />
         <Route path="*" element={<Navigate to="/" replace />} />
diff --git a/web/src/components/TaskDetail.tsx b/web/src/components/TaskDetail.tsx
index 519ce70..b477518 100644
--- a/web/src/components/TaskDetail.tsx
+++ b/web/src/components/TaskDetail.tsx
@@ -201,6 +201,25 @@ export function TaskDetail({
     }
   }
 
+  /** 把这件事整理成知识草稿。草稿默认待核对，不直接发布。 */
+  async function toKnowledge() {
+    if (!item) return;
+    setBusy(true);
+    setError(null);
+    try {
+      await api.post(`${base}/knowledge?doc_type=${item.kind === "ticket" ? "postmortem" : "howto"}`);
+      setNotice("已生成知识草稿。它现在在「知识 → 待核对」里，核对无误后再发布，才会进入团队检索。");
+    } catch (err) {
+      if (err instanceof ApiError && err.code === 7002) {
+        setNotice("这件事已经有一份知识草稿了，去「知识」页找它。");
+      } else {
+        setError(err instanceof ApiError ? err.message : "生成失败");
+      }
+    } finally {
+      setBusy(false);
+    }
+  }
+
   async function ticketAction(action: TicketAction, extra: Record<string, unknown> = {}) {
     if (!item) return;
     setBusy(true);
@@ -412,6 +431,20 @@ export function TaskDetail({
               </div>
             )}
 
+            {item.kind !== "knowledge" && item.status !== "canceled" && (
+              <div className="mt-4 rounded-lg border border-ink-100 p-3">
+                <p className="text-sm font-medium">这件事值得留下来？沉淀成知识</p>
+                <p className="mt-1 text-xs text-ink-500">
+                  会把标题、备注、时间线和评论整理成一份草稿，默认进「待核对」，不会直接对外发布。
+                </p>
+                <div className="mt-2">
+                  <button className="btn-ghost px-3 py-1 text-sm" disabled={busy} onClick={() => void toKnowledge()}>
+                    {item.kind === "ticket" ? "沉淀成复盘" : "沉淀成知识"}
+                  </button>
+                </div>
+              </div>
+            )}
+
             {notice && <p className="mt-3 text-sm text-emerald-700">{notice}</p>}
             {error && <p className="mt-3 text-sm text-red-600">{error}</p>}
             {busy && <p className="mt-3 text-xs text-ink-500">处理中…</p>}
diff --git a/web/src/components/WorkspaceNav.tsx b/web/src/components/WorkspaceNav.tsx
index 9467a02..5cefa7a 100644
--- a/web/src/components/WorkspaceNav.tsx
+++ b/web/src/components/WorkspaceNav.tsx
@@ -6,6 +6,7 @@ const TABS = [
   { path: "", label: "任务" },
   { path: "/board", label: "看板" },
   { path: "/tickets", label: "工单" },
+  { path: "/knowledge", label: "知识" },
   { path: "/members", label: "成员" },
 ];
 
diff --git a/web/src/lib/types.ts b/web/src/lib/types.ts
index 43f4ba0..b8a396e 100644
--- a/web/src/lib/types.ts
+++ b/web/src/lib/types.ts
@@ -112,3 +112,31 @@ export interface Notification {
   read_at: string | null;
   created_at: string;
 }
+
+export type KnowledgeStatus = "draft" | "in_review" | "published" | "archived";
+
+export interface KnowledgeInfo {
+  doc_type: string;
+  summary: string;
+  status_hint: KnowledgeStatus;
+  source_kind: "manual" | "task" | "ticket";
+  source_item_id: string | null;
+  generated_by: "human" | "rule";
+  published_at: string | null;
+  archived_at: string | null;
+  chunk_count: number;
+  author_id: string;
+}
+
+export interface KnowledgeSource {
+  id: string;
+  kind: string;
+  title: string;
+  status: string;
+}
+
+export interface Knowledge extends Item {
+  knowledge: KnowledgeInfo;
+  source: KnowledgeSource | null;
+  activities?: Activity[];
+}
diff --git a/web/src/pages/Knowledge.tsx b/web/src/pages/Knowledge.tsx
new file mode 100644
index 0000000..a367b8f
--- /dev/null
+++ b/web/src/pages/Knowledge.tsx
@@ -0,0 +1,390 @@
+import { useCallback, useEffect, useRef, useState } from "react";
+import { useParams } from "react-router-dom";
+import { Layout } from "../components/Layout";
+import { WorkspaceNav } from "../components/WorkspaceNav";
+import { ApiError, api } from "../lib/client";
+import type { Knowledge, KnowledgeStatus } from "../lib/types";
+
+const TABS = [
+  { key: "draft", label: "待核对", statuses: ["draft", "in_review"] },
+  { key: "published", label: "已发布", statuses: ["published"] },
+  { key: "archived", label: "已归档", statuses: ["archived"] },
+  { key: "all", label: "全部", statuses: [] },
+] as const;
+
+const DOC_TYPE_LABEL: Record<string, string> = {
+  note: "笔记",
+  howto: "怎么做",
+  faq: "常见问题",
+  postmortem: "复盘",
+  decision: "决策",
+};
+
+const STATUS_LABEL: Record<KnowledgeStatus, string> = {
+  draft: "草稿",
+  in_review: "待审议",
+  published: "已发布",
+  archived: "已归档",
+};
+
+const SOURCE_LABEL: Record<string, string> = {
+  manual: "手记",
+  task: "来自任务",
+  ticket: "来自工单",
+};
+
+const ACTION_LABEL: Record<string, string> = {
+  submit_review: "提交审议",
+  withdraw: "撤回审议",
+  publish: "发布",
+  archive: "归档",
+  restore: "恢复成草稿",
+};
+
+export function KnowledgePage() {
+  const { wsId = "" } = useParams();
+  const [tab, setTab] = useState<(typeof TABS)[number]["key"]>("draft");
+  const [q, setQ] = useState("");
+  const [docs, setDocs] = useState<Knowledge[]>([]);
+  const [cursor, setCursor] = useState<string | null>(null);
+  const [loading, setLoading] = useState(false);
+  const [error, setError] = useState<string | null>(null);
+  const [openId, setOpenId] = useState<string | null>(null);
+  const [adding, setAdding] = useState(false);
+  const [draftTitle, setDraftTitle] = useState("");
+  const reqId = useRef(0);
+
+  const load = useCallback(
+    async (nextCursor: string | null) => {
+      // 切 tab / 改搜索会连发请求，慢的回来会盖掉新结果
+      const mine = ++reqId.current;
+      setLoading(true);
+      setError(null);
+      try {
+        const qs = new URLSearchParams();
+        const statuses = TABS.find((t) => t.key === tab)!.statuses;
+        for (const s of statuses) qs.append("status", s);
+        if (q.trim()) qs.set("q", q.trim());
+        if (nextCursor) qs.set("cursor", nextCursor);
+        const page = await api.get<{
+          items: Knowledge[];
+          next_cursor: string | null;
+          has_more: boolean;
+        }>(`/workspaces/${wsId}/knowledge?${qs.toString()}`);
+        if (mine !== reqId.current) return;
+        setDocs((prev) => (nextCursor ? [...prev, ...page.items] : page.items));
+        setCursor(page.has_more ? page.next_cursor : null);
+      } catch (err) {
+        if (mine !== reqId.current) return;
+        setError(err instanceof ApiError ? err.message : "知识加载失败");
+      } finally {
+        if (mine === reqId.current) setLoading(false);
+      }
+    },
+    [wsId, tab, q],
+  );
+
+  useEffect(() => {
+    void load(null);
+  }, [load]);
+
+  async function addNote() {
+    const title = draftTitle.trim();
+    if (!title) return;
+    try {
+      const doc = await api.post<Knowledge>(`/workspaces/${wsId}/knowledge`, {
+        title,
+        doc_type: "note",
+      });
+      setDraftTitle("");
+      setAdding(false);
+      setTab("draft");
+      setOpenId(doc.id);
+      void load(null);
+    } catch (err) {
+      setError(err instanceof ApiError ? err.message : "保存失败");
+    }
+  }
+
+  return (
+    <Layout>
+      <div className="mb-5 flex flex-wrap items-center justify-between gap-3">
+        <div>
+          <h1 className="text-lg font-semibold">知识</h1>
+          <p className="mt-0.5 text-xs text-ink-500">
+            工单验收通过会自动整理一份草稿；核对无误再发布，发布后才会进入团队检索
+          </p>
+        </div>
+        <WorkspaceNav wsId={wsId} />
+      </div>
+
+      <div className="mb-3 flex flex-wrap items-center gap-2">
+        {TABS.map((t) => (
+          <button
+            key={t.key}
+            onClick={() => setTab(t.key)}
+            className={`rounded-full px-3 py-1 text-sm transition ${
+              tab === t.key ? "bg-ink-900 text-white" : "bg-ink-100 text-ink-700 hover:bg-ink-100/70"
+            }`}
+          >
+            {t.label}
+          </button>
+        ))}
+        <input
+          className="input ml-auto w-56"
+          placeholder="搜标题或正文…"
+          value={q}
+          onChange={(e) => setQ(e.target.value)}
+        />
+        <button className="btn-primary px-3 py-1 text-sm" onClick={() => setAdding((v) => !v)}>
+          记一条
+        </button>
+      </div>
+
+      {adding && (
+        <div className="card mb-3">
+          <p className="mb-2 text-xs text-ink-500">
+            手记的知识没有来源，它是你自己的笔记；想沉淀某件事，去那件事的详情里点「沉淀成知识」。
+          </p>
+          <div className="flex gap-2">
+            <input
+              className="input flex-1"
+              placeholder="一句话标题，比如「报销单要贴发票原件」"
+              value={draftTitle}
+              onChange={(e) => setDraftTitle(e.target.value)}
+              onKeyDown={(e) => {
+                if (e.key === "Enter") void addNote();
+              }}
+            />
+            <button className="btn-primary px-3 py-1 text-sm" onClick={() => void addNote()}>
+              保存
+            </button>
+          </div>
+        </div>
+      )}
+
+      {error && <p className="mb-3 rounded-lg bg-red-50 p-2 text-sm text-red-700">{error}</p>}
+
+      {docs.length === 0 && !loading && (
+        <div className="card text-center text-sm text-ink-500">
+          {tab === "draft"
+            ? "还没有待核对的知识。把工单验收通过，或者在这里「记一条」。"
+            : "这里还空着。"}
+        </div>
+      )}
+
+      <ul className="space-y-2">
+        {docs.map((d) => (
+          <li key={d.id} className="card">
+            <div className="flex items-start justify-between gap-3">
+              <button className="min-w-0 flex-1 text-left" onClick={() => setOpenId(d.id)}>
+                <p className="truncate text-sm font-medium">{d.title}</p>
+                <p className="mt-1 flex flex-wrap items-center gap-2 text-xs text-ink-500">
+                  <span className="rounded bg-ink-100 px-1.5 py-0.5">
+                    {DOC_TYPE_LABEL[d.knowledge.doc_type] ?? d.knowledge.doc_type}
+                  </span>
+                  <span>{STATUS_LABEL[d.knowledge.status_hint]}</span>
+                  <span>{SOURCE_LABEL[d.knowledge.source_kind] ?? d.knowledge.source_kind}</span>
+                  {d.source && <span className="truncate">「{d.source.title}」</span>}
+                  <span>{new Date(d.updated_at).toLocaleString("zh-CN")}</span>
+                </p>
+              </button>
+              <button className="btn-ghost shrink-0 px-2 py-1 text-xs" onClick={() => setOpenId(d.id)}>
+                打开
+              </button>
+            </div>
+          </li>
+        ))}
+      </ul>
+
+      {cursor && (
+        <div className="mt-4 text-center">
+          <button className="btn-ghost" disabled={loading} onClick={() => void load(cursor)}>
+            {loading ? "加载中…" : "加载更多"}
+          </button>
+        </div>
+      )}
+
+      {openId && (
+        <KnowledgeDrawer
+          wsId={wsId}
+          itemId={openId}
+          onClose={() => setOpenId(null)}
+          onChanged={() => void load(null)}
+        />
+      )}
+    </Layout>
+  );
+}
+
+/** 知识详情抽屉：能改、能提交审议、能发布/归档。 */
+function KnowledgeDrawer({
+  wsId,
+  itemId,
+  onClose,
+  onChanged,
+}: {
+  wsId: string;
+  itemId: string;
+  onClose: () => void;
+  onChanged: () => void;
+}) {
+  const [doc, setDoc] = useState<Knowledge | null>(null);
+  const [error, setError] = useState<string | null>(null);
+  const [title, setTitle] = useState("");
+  const [body, setBody] = useState("");
+  const [busy, setBusy] = useState(false);
+
+  const load = useCallback(async () => {
+    try {
+      const data = await api.get<Knowledge>(`/workspaces/${wsId}/knowledge/${itemId}`);
+      setDoc(data);
+      setTitle(data.title);
+      setBody(data.body_md);
+    } catch (err) {
+      setError(err instanceof ApiError ? err.message : "加载失败");
+    }
+  }, [wsId, itemId]);
+
+  useEffect(() => {
+    void load();
+  }, [load]);
+
+  async function save() {
+    if (!doc) return;
+    setBusy(true);
+    setError(null);
+    try {
+      const next = await api.patch<Knowledge>(`/workspaces/${wsId}/knowledge/${itemId}`, {
+        title,
+        body_md: body,
+        version: doc.version,
+      });
+      setDoc(next);
+      onChanged();
+    } catch (err) {
+      if (err instanceof ApiError && err.code === 4009) {
+        setError("刚被别人改过，已刷新为最新内容");
+        await load();
+      } else {
+        setError(err instanceof ApiError ? err.message : "保存失败");
+      }
+    } finally {
+      setBusy(false);
+    }
+  }
+
+  async function act(action: string) {
+    if (!doc) return;
+    setBusy(true);
+    setError(null);
+    try {
+      const next = await api.post<Knowledge>(`/workspaces/${wsId}/knowledge/${itemId}/status`, {
+        action,
+        version: doc.version,
+      });
+      setDoc(next);
+      onChanged();
+    } catch (err) {
+      setError(err instanceof ApiError ? err.message : "操作失败");
+      await load();
+    } finally {
+      setBusy(false);
+    }
+  }
+
+  const status = doc?.knowledge.status_hint;
+  const canEdit = status === "draft" || status === "in_review";
+  const actions: { key: string; label: string; show: boolean }[] = [
+    { key: "submit_review", label: ACTION_LABEL.submit_review, show: status === "draft" },
+    { key: "withdraw", label: ACTION_LABEL.withdraw, show: status === "in_review" },
+    {
+      key: "publish",
+      label: ACTION_LABEL.publish,
+      show: status === "draft" || status === "in_review",
+    },
+    {
+      key: "archive",
+      label: ACTION_LABEL.archive,
+      show: status === "draft" || status === "in_review" || status === "published",
+    },
+    { key: "restore", label: ACTION_LABEL.restore, show: status === "archived" },
+  ];
+
+  return (
+    <div className="fixed inset-0 z-20 flex justify-end bg-ink-900/20" onClick={onClose}>
+      <aside
+        className="flex h-full w-full max-w-xl flex-col overflow-y-auto bg-white p-6 shadow-xl"
+        onClick={(e) => e.stopPropagation()}
+      >
+        {!doc ? (
+          <p className="text-sm text-ink-500">{error ?? "加载中…"}</p>
+        ) : (
+          <>
+            <div className="mb-4 flex items-center justify-between text-xs text-ink-500">
+              <span>
+                {DOC_TYPE_LABEL[doc.knowledge.doc_type] ?? doc.knowledge.doc_type} ·{" "}
+                {STATUS_LABEL[doc.knowledge.status_hint]} · 版本 {doc.version}
+              </span>
+              <button className="btn-ghost px-2 py-1 text-xs" onClick={onClose}>
+                关闭
+              </button>
+            </div>
+
+            <div className="mb-4 rounded-lg border border-ink-100 bg-ink-50 p-3 text-xs text-ink-700">
+              {doc.source ? (
+                <p>
+                  来源：{doc.source.kind === "ticket" ? "工单" : "任务"}「{doc.source.title}」
+                </p>
+              ) : (
+                <p>来源：手记（没有关联的事项）</p>
+              )}
+              <p className="mt-1">
+                {doc.knowledge.generated_by === "rule"
+                  ? "这份草稿由系统整理，请核对后再发布。"
+                  : "手动创建。"}
+                {doc.knowledge.published_at &&
+                  ` 发布于 ${new Date(doc.knowledge.published_at).toLocaleString("zh-CN")}。`}
+              </p>
+            </div>
+
+            <input
+              className="input mb-3"
+              value={title}
+              disabled={!canEdit}
+              onChange={(e) => setTitle(e.target.value)}
+            />
+            <textarea
+              className="input mb-3 min-h-[280px] font-mono text-xs"
+              value={body}
+              disabled={!canEdit}
+              onChange={(e) => setBody(e.target.value)}
+            />
+
+            {canEdit && (
+              <button className="btn-primary mb-4 self-start" disabled={busy} onClick={() => void save()}>
+                {busy ? "保存中…" : "保存"}
+              </button>
+            )}
+
+            <div className="mb-2 flex flex-wrap gap-2">
+              {actions
+                .filter((a) => a.show)
+                .map((a) => (
+                  <button
+                    key={a.key}
+                    className={a.key === "publish" ? "btn-primary px-3 py-1 text-sm" : "btn-ghost px-3 py-1 text-sm"}
+                    disabled={busy}
+                    onClick={() => void act(a.key)}
+                  >
+                    {a.label}
+                  </button>
+                ))}
+            </div>
+            {error && <p className="text-sm text-red-700">{error}</p>}
+          </>
+        )}
+      </aside>
+    </div>
+  );
+}