diff --git a/backend/contracts/prescreen.py b/backend/contracts/prescreen.py
index 2bca91d..0793323 100644
--- a/backend/contracts/prescreen.py
+++ b/backend/contracts/prescreen.py
@@ -415,3 +415,115 @@ class CaseTimeline(Contract):
         if self.status == "ready" and any(e.occurred_at is None for e in self.events):
             raise ValueError("存在缺发生时间的事件时状态不得为 ready")
         return self
+
+
+# ---------------------------------------------------------------- 知识卡片（T05-b）
+class Origin(StrEnum):
+    """知识创建来源，与 data_domain 正交（docs/v2/14-experience-loop.md §4）。"""
+
+    history_derived = "history_derived"
+    manual = "manual"
+    policy_import = "policy_import"
+
+
+class GovernanceStatus(StrEnum):
+    draft = "draft"
+    in_review = "in_review"
+    published = "published"
+    rejected = "rejected"
+    withdrawn = "withdrawn"
+
+
+class RuleEffect(StrEnum):
+    advisory = "advisory"
+    hard = "hard"
+
+
+class Condition(Contract):
+    """安全条件表达：只允许字段白名单 + 有限算子，不执行表达式（03 §9.1）。"""
+
+    field: str = Field(min_length=1, max_length=ID_MAX)
+    operator: Literal["eq", "in", "present", "absent", "gt", "gte", "lt", "lte"]
+    value: str | bool | list[str] | None = None
+
+    @model_validator(mode="after")
+    def _check_value_shape(self) -> Condition:
+        if self.operator == "in":
+            if not isinstance(self.value, list) or not self.value:
+                raise ValueError("in 算子需要非空列表")
+        elif self.operator in ("present", "absent"):
+            if self.value is not None:
+                raise ValueError("present/absent 不接受取值")
+        elif self.operator in ("gt", "gte", "lt", "lte"):
+            # 数值算子必须声明可解析的数值；比较口径由程序校验，不做表达式求值
+            try:
+                float(str(self.value))
+            except (TypeError, ValueError):
+                raise ValueError("数值算子需要可解析的数值") from None
+        return self
+
+
+class RuleContent(Contract):
+    """规则内容。hard 必须具备正式依据与独立审核（BR-26 / E-18）。"""
+
+    effect: RuleEffect
+    predicate: list[Condition] = Field(min_length=1, max_length=32)
+    on_match: Literal["flag", "block"]
+    basis_evidence_ids: list[Identifier] = Field(default_factory=list, max_length=EVIDENCE_MAX)
+    policy_ref: Ref | None = None
+    authorization_ref: Ref | None = None
+
+    @model_validator(mode="after")
+    def _check_hard_basis(self) -> RuleContent:
+        if self.effect == RuleEffect.hard:
+            if self.policy_ref is None and self.authorization_ref is None:
+                raise ValueError("硬性规则需要正式制度或授权依据，仅凭历史频次不足")
+            if not self.basis_evidence_ids:
+                raise ValueError("硬性规则必须附依据证据")
+        return self
+
+
+class KnowledgeCard(Contract):
+    """Skill/Rule 卡片的目标投影。
+
+    **命名冲突提示**：本类的 `card_scope` 是 project/team（03 §9.2），而既有
+    `component_registry` 里的 `scope` 表示数据域 demo/production。二者语义不同，
+    投影层必须显式映射，不得互相顶替。
+    """
+
+    id: Identifier
+    project_id: Identifier
+    data_domain: DataDomain
+    revision: int = Field(ge=1)
+    version: str = Field(min_length=1, max_length=70)
+    kind: str = Field(min_length=1, max_length=40)
+    title: str = Field(min_length=1, max_length=200)
+    origin: Origin
+    status: GovernanceStatus
+    source_event_ids: list[Identifier] = Field(default_factory=list, max_length=EVIDENCE_MAX)
+    source_evidence_ids: list[Identifier] = Field(default_factory=list, max_length=EVIDENCE_MAX)
+    parent_version: Ref | None = None
+    created_by: Identifier
+    edited_by: Identifier
+    card_scope: Literal["project", "team"]
+    team_id: str | None = Field(default=None, max_length=ID_MAX)
+    conditions: list[Condition] = Field(default_factory=list, max_length=32)
+    exceptions: list[Condition] = Field(default_factory=list, max_length=32)
+    effective_at: AwareDatetime
+    expires_at: AwareDatetime | None = None
+    reviewer_id: Identifier | None = None
+    evaluation_ref: Ref | None = None
+    rule: RuleContent | None = None
+
+    @model_validator(mode="after")
+    def _check_card(self) -> KnowledgeCard:
+        if self.card_scope == "team" and not self.team_id:
+            raise ValueError("team 范围的卡片必须有 team_id")
+        if self.origin == Origin.history_derived and not (
+                self.source_event_ids or self.source_evidence_ids):
+            raise ValueError("历史提炼卡片必须保留来源（事件或证据）")
+        if self.status == GovernanceStatus.published and self.reviewer_id is None:
+            raise ValueError("已发布卡片必须有审核人")
+        if self.effective_at and self.expires_at and self.expires_at <= self.effective_at:
+            raise ValueError("有效期必须晚于生效时间")
+        return self
diff --git a/backend/services/knowledge_cards.py b/backend/services/knowledge_cards.py
new file mode 100644
index 0000000..dc48c54
--- /dev/null
+++ b/backend/services/knowledge_cards.py
@@ -0,0 +1,198 @@
+"""T05-b 知识卡片：既有 Skill/Rule 治理的目标投影。
+
+**不新建第二套发布库**（docs/v2/03-detailed-design.md §9.2 明文）。本模块只负责三件事：
+
+1. **投影字段**：origin、谱系（parent_version）、数据域、卡片范围（project/team）、条件与例外
+2. **硬规则门禁**：hard 必须有正式制度/授权依据与依据证据（BR-26 / E-18）
+3. **有效性过滤**：按数据域 / 状态 / 有效期 / 范围筛选可应用的已发布版本（BR-04）
+
+状态机与发布**完全委托** `component_registry.draft()` / `release()`，因此既有保证
+原样生效、不重复实现：
+- 自批拒绝：`release()` 里 `edited_by == actor` → PermissionError（AC-03 / AC-43）
+- 评测门禁：候选哈希必须匹配通过的隔离评测（AC-34）
+- 已发布不可覆盖：`component_version` 以 immutable 写入；改已发布需新版本号
+- 工具白名单、方案预算等既有校验
+
+**命名映射（不得互相顶替）**：
+- 本设计的 `card_scope`（project/team）↔ 注册表无此概念，作为附加键保存
+- 本设计的 `data_domain` ↔ 注册表的 `scope`（demo/production）——**同一个键名、不同语义**，
+  投影时显式互换，绝不混用
+"""
+
+from __future__ import annotations
+
+from contracts.prescreen import Condition, KnowledgeCard, Origin, RuleEffect
+from services import assistant_store as store
+from services import component_registry as registry
+
+ORIGINS = tuple(item.value for item in Origin)
+EFFECTS = tuple(item.value for item in RuleEffect)
+
+HARD_BASIS_REQUIRED = "硬性规则需要正式制度或授权依据，仅凭历史频次不足；当前仅可保存为建议草稿"
+
+
+def _check_hard_basis(body: dict) -> None:
+    """hard 规则的资格校验（BR-26 / E-18）。advisory 不设门槛。"""
+    if body.get("kind") != "rule_set":
+        return
+    effect = body.get("effect", "advisory")
+    if effect not in EFFECTS:
+        raise ValueError(f"规则效果取值须为 {' 或 '.join(EFFECTS)}")
+    if effect != "hard":
+        return
+    if not (body.get("policy_ref") or body.get("authorization_ref")):
+        raise ValueError(HARD_BASIS_REQUIRED)
+    if not body.get("basis_evidence_ids"):
+        raise ValueError("硬性规则必须附依据证据，不能只有结论")
+
+
+# 注册表既有的条件形状与本设计的 Condition **不是同一套**：
+#   注册表：{code, field, operator, threshold, title, suggestion}
+#   本设计：{field, operator, value}
+# 因此投影层做**翻译**，而不是把一方强加给另一方——注册表体按它自己的形状保存，
+# 卡片侧只暴露可安全求值的字段，展示性字段（title/suggestion）不进契约。
+# 只映射注册表**实际可能产出**的算子：component_registry.validate() 要求
+# operator ∈ (gt, lt, eq, gte, lte) 且 threshold 可解析为数值。
+# 本设计的 Condition 还允许 in/present/absent，但它们不可能来自注册表条件，
+# 故不在此表中——出现即报错，避免把不可能的取值当成已支持。
+_OPERATORS = {"eq": "eq", "lt": "lt", "lte": "lte", "gt": "gt", "gte": "gte"}
+
+
+def _translate_conditions(conditions, label: str) -> list[dict]:
+    """把注册表条件翻译为设计的安全条件；无法表达即报错，不静默丢弃。"""
+    parsed = []
+    for index, item in enumerate(conditions or ()):
+        if not isinstance(item, dict):
+            raise ValueError(f"{label}第 {index + 1} 条不是对象")
+        operator = _OPERATORS.get(str(item.get("operator", "")).strip().lower())
+        if operator is None:
+            raise ValueError(f"{label}第 {index + 1} 条算子不受支持：{item.get('operator')!r}")
+        raw = item.get("threshold", item.get("value"))
+        value = raw if isinstance(raw, (list, bool)) else (None if raw is None else str(raw))
+        try:
+            parsed.append(Condition(field=str(item.get("field", "")), operator=operator,
+                                    value=value).model_dump(mode="json"))
+        except Exception as exc:
+            raise ValueError(f"{label}第 {index + 1} 条不合法：{exc}") from exc
+    if not parsed and conditions:
+        raise ValueError(f"{label}无法表达为安全条件")
+    return parsed
+
+
+def propose(db, body: dict, actor: str, project_id: str, origin: str = "manual",
+            source_event_ids=(), source_evidence_ids=(), parent_version: dict | None = None,
+            card_scope: str = "project", team_id: str | None = None):
+    """提议一张知识卡片草稿。**只生成草稿，绝不直接生效**（BR-03 / AC-26）。"""
+    if origin not in ORIGINS:
+        raise ValueError(f"来源取值须为 {' 或 '.join(ORIGINS)}")
+    if card_scope not in ("project", "team"):
+        raise ValueError("卡片范围须为 project 或 team")
+    if card_scope == "team" and not team_id:
+        raise ValueError("team 范围的卡片必须有 team_id")
+    if origin == "history_derived" and not (source_event_ids or source_evidence_ids):
+        raise ValueError("历史提炼卡片必须保留来源（事件或证据），不得成为无源知识")
+    if "data_domain" in body:
+        raise ValueError("请用 scope 声明数据域（注册表既有约定），不要另传 data_domain")
+
+    _check_hard_basis(body)
+    enriched = dict(
+        body,
+        origin=origin,
+        project_id=project_id,
+        card_scope=card_scope,
+        team_id=team_id,
+        parent_version=parent_version,
+        source_event_ids=list(source_event_ids),
+        source_evidence_ids=list(source_evidence_ids),
+    )
+    # 只校验"能否表达为安全条件"，不改写注册表既有的条件形状
+    _translate_conditions(body.get("conditions"), "适用条件")
+    _translate_conditions(body.get("exceptions"), "例外")
+    # 委托既有治理：normalize + validate + 写入 component_draft
+    return registry.draft(db, enriched, actor)
+
+
+def publish(db, draft_id: str, actor: str, preview: bool = False):
+    """发布草稿。自批与评测门禁由 `component_registry.release()` 保证。"""
+    body = store.get(db, "component_draft", draft_id)
+    # 门禁在发布时**再查一次**：草稿可能在提议之后被改动，不能只信提议时的校验
+    _check_hard_basis(body)
+    return registry.release(db, draft_id, actor, preview)
+
+
+def _project(body: dict) -> dict:
+    """把注册表对象投影为 KnowledgeCard。scope↔data_domain 在此完成互换。"""
+    domain = body.get("scope")
+    if domain not in ("demo", "production"):
+        raise ValueError("组件的数据域不合法，无法投影为卡片")
+    # 内置种子组件是**全局**的（无 project_id / edited_by），不是项目知识卡片。
+    # 明确报错而不是让 pydantic 抛出难懂的信息——否则容易把内置 Skill 误当项目卡片。
+    if not body.get("project_id") or not body.get("edited_by"):
+        raise ValueError(
+            "该组件不是项目知识卡片（缺少 project_id 或 edited_by）；"
+            "内置 Skill/规则集属全局配置，请勿投影为卡片"
+        )
+    card = {
+        "id": body.get("component_id") or body["id"],
+        "project_id": body.get("project_id") or "",
+        "data_domain": domain,                      # ← 注册表 scope
+        "revision": body.get("revision", 1),
+        "version": body.get("version", "1.0.0"),
+        "kind": body.get("kind", ""),
+        "title": body.get("name") or body.get("title") or "",
+        "origin": body.get("origin", "manual"),
+        "status": body.get("status", "draft"),
+        "source_event_ids": body.get("source_event_ids", []),
+        "source_evidence_ids": body.get("source_evidence_ids", []),
+        "parent_version": body.get("parent_version"),
+        "created_by": body.get("owner") or body.get("edited_by", ""),
+        "edited_by": body.get("edited_by", ""),
+        "card_scope": body.get("card_scope", "project"),
+        "team_id": body.get("team_id"),
+        "conditions": _translate_conditions(body.get("conditions"), "适用条件"),
+        "exceptions": _translate_conditions(body.get("exceptions"), "例外"),
+        "effective_at": body.get("effective_from") or store.now(),
+        "expires_at": body.get("expires_at"),
+        "reviewer_id": body.get("approved_by"),
+        "rule": None,
+    }
+    if body.get("kind") == "rule_set":
+        card["rule"] = {
+            "effect": body.get("effect", "advisory"),
+            "predicate": _translate_conditions(
+                body.get("predicate") or body.get("conditions"), "规则条件") or [
+                    {"field": "unknown", "operator": "present"}],
+            "on_match": body.get("on_match", "flag"),
+            "basis_evidence_ids": body.get("basis_evidence_ids", []),
+            "policy_ref": body.get("policy_ref"),
+            "authorization_ref": body.get("authorization_ref"),
+        }
+    return KnowledgeCard(**card).model_dump(mode="json")
+
+
+def draft_card(db, draft_id: str) -> dict:
+    return _project(store.get(db, "component_draft", draft_id))
+
+
+def published_cards(db, domain: str) -> list[dict]:
+    return [_project(row) for row in store.listing(db, "component_version")
+            if row.get("status") == "published" and row.get("scope") == domain]
+
+
+def effective(db, domain: str, project_id: str | None = None, at: str | None = None) -> list[dict]:
+    """可应用的已发布卡片（BR-04：先按数据域/状态/有效期/范围过滤）。
+
+    用户级权限（OQ-02）尚未建设，故此处只做域、有效期与范围过滤；
+    **不得**据此宣称已完成授权过滤。
+    """
+    moment = at or store.now()
+    result = []
+    for card in published_cards(db, domain):
+        if card["expires_at"] and card["expires_at"] <= moment:
+            continue
+        if card["card_scope"] == "project" and project_id and card["project_id"] != project_id:
+            continue
+        if card["card_scope"] == "team" and not card["team_id"]:
+            continue
+        result.append(card)
+    return result
diff --git a/backend/test_knowledge_cards.py b/backend/test_knowledge_cards.py
new file mode 100644
index 0000000..deb001f
--- /dev/null
+++ b/backend/test_knowledge_cards.py
@@ -0,0 +1,224 @@
+"""T05-b 知识卡片治理测试：AC-03 / AC-25 / AC-27 / AC-43。
+
+重点证明两件事：
+1. **没有第二套发布库**：发布路径完全走既有 component_registry，因此自批拒绝、
+   评测门禁、已发布不可覆盖这些既有保证对新卡片同样生效。
+2. **硬规则有正式依据门槛**：只有历史频次的候选不得发布为 hard（E-18）。
+"""
+
+import tempfile
+import unittest
+from pathlib import Path
+
+from services import assistant_store as store
+from services import component_registry as registry
+from services import knowledge_cards as cards
+
+
+def rule_body(**over):
+    body = {
+        "id": "corporate.test_rule", "kind": "rule_set", "name": "测试规则",
+        "scope": "demo", "version": "1.0.0",
+        # 注册表规则条件的形状：operator ∈ (gt,lt,eq,gte,lte) 且 threshold 可解析为数值，
+        # title/suggestion 是展示字段（不进设计契约）
+        "conditions": [{"field": "metrics.coverage", "operator": "lt", "threshold": "1.2",
+                        "title": "覆盖不足", "suggestion": "请补充担保措施"}],
+        "effect": "advisory", "on_match": "flag",
+    }
+    body.update(over)
+    return body
+
+
+class KnowledgeCardTestCase(unittest.TestCase):
+    def setUp(self):
+        self._tmp = tempfile.TemporaryDirectory(ignore_cleanup_errors=True)
+        self.db_path = Path(self._tmp.name) / "cards.sqlite3"
+        store.initialize(self.db_path)
+
+    def tearDown(self):
+        self._tmp.cleanup()
+
+    def propose(self, body=None, origin="manual", **kwargs):
+        with store.transaction(self.db_path) as db:
+            return cards.propose(db, body or rule_body(), "demo-manager", "DEMO-A",
+                                 origin=origin, **kwargs)
+
+    def publish(self, draft_id, actor, preview=False):
+        with store.transaction(self.db_path) as db:
+            return cards.publish(db, draft_id, actor, preview)
+
+
+class HardRuleGateTests(KnowledgeCardTestCase):
+    def test_frequency_only_candidate_cannot_be_hard(self):
+        # AC-27：只有历史频次，没有正式依据 → 拒绝 hard
+        with self.assertRaises(ValueError) as ctx:
+            self.propose(rule_body(effect="hard"))
+        self.assertIn("正式制度或授权依据", str(ctx.exception))
+        self.assertIn("仅可保存为建议草稿", str(ctx.exception))
+
+    def test_frequency_only_candidate_can_stay_advisory(self):
+        draft = self.propose(rule_body(effect="advisory"))
+        self.assertEqual(draft["status"], "draft")
+        self.assertEqual(draft["effect"], "advisory")
+
+    def test_hard_with_policy_reference_is_accepted(self):
+        draft = self.propose(rule_body(
+            effect="hard", on_match="block",
+            policy_ref={"id": "policy.credit-2025", "version": "v3"},
+            basis_evidence_ids=["ev-1"]))
+        self.assertEqual(draft["effect"], "hard")
+
+    def test_hard_requires_basis_evidence_too(self):
+        with self.assertRaises(ValueError) as ctx:
+            self.propose(rule_body(effect="hard",
+                                   policy_ref={"id": "p", "version": "v1"}))
+        self.assertIn("依据证据", str(ctx.exception))
+
+    def test_gate_is_rechecked_at_publish_time(self):
+        # 草稿在提议后被改成 hard（模拟旁路），发布时必须再查一次
+        draft = self.propose(rule_body(effect="advisory"))
+        with store.transaction(self.db_path) as db:
+            row = store.get(db, "component_draft", draft["id"])
+            row["effect"] = "hard"
+            store.put(db, "component_draft", row)
+        with self.assertRaises(ValueError) as ctx:
+            self.publish(draft["id"], "demo-reviewer")
+        self.assertIn("正式制度或授权依据", str(ctx.exception))
+
+    def test_unknown_effect_is_rejected(self):
+        with self.assertRaises(ValueError):
+            self.propose(rule_body(effect="mandatory"))
+
+    def test_conditions_are_validated(self):
+        with self.assertRaises(ValueError):
+            self.propose(rule_body(conditions=[{"field": "f", "operator": "present"}]))
+
+
+class OriginAndLineageTests(KnowledgeCardTestCase):
+    def test_history_derived_requires_sources(self):
+        with self.assertRaises(ValueError) as ctx:
+            self.propose(rule_body(), origin="history_derived")
+        self.assertIn("必须保留来源", str(ctx.exception))
+
+    def test_history_derived_keeps_lineage_after_manual_edit(self):
+        # AC-25：历史提炼卡被人工编辑后仍是历史来源，并保留父版本
+        draft = self.propose(rule_body(id="corporate.from_history"), origin="history_derived",
+                             source_event_ids=["event-1"])
+        edited = self.propose(rule_body(id="corporate.from_history", version="1.0.1"),
+                              origin="history_derived", source_event_ids=["event-1"],
+                              parent_version={"id": "corporate.from_history", "version": "1.0.0"})
+        with store.transaction(self.db_path) as db:
+            card = cards.draft_card(db, edited["id"])
+        self.assertEqual(card["origin"], "history_derived")
+        self.assertEqual(card["parent_version"], {"id": "corporate.from_history", "version": "1.0.0"})
+        self.assertEqual(card["source_event_ids"], ["event-1"])
+        self.assertNotEqual(draft["id"], edited["id"])
+
+    def test_manual_card_has_manual_origin_and_no_history_sources(self):
+        with store.transaction(self.db_path) as db:
+            card = cards.draft_card(db, self.propose(rule_body(id="corporate.by_hand"))["id"])
+        self.assertEqual(card["origin"], "manual")
+        self.assertEqual(card["source_event_ids"], [])
+
+    def test_data_domain_maps_to_registry_scope_not_card_scope(self):
+        # 两个 scope 语义不同：data_domain 落注册表 scope，卡片范围落 card_scope
+        with store.transaction(self.db_path) as db:
+            card = cards.draft_card(db, self.propose(
+                rule_body(id="corporate.scoped", scope="production"),
+                card_scope="team", team_id="team-1")["id"])
+        self.assertEqual(card["data_domain"], "production")
+        self.assertEqual(card["card_scope"], "team")
+        self.assertEqual(card["team_id"], "team-1")
+
+    def test_team_scope_requires_team_id(self):
+        with self.assertRaises(ValueError):
+            self.propose(rule_body(), card_scope="team")
+
+    def test_callers_cannot_smuggle_data_domain_key(self):
+        with self.assertRaises(ValueError) as ctx:
+            self.propose(rule_body(data_domain="production"))
+        self.assertIn("不要另传 data_domain", str(ctx.exception))
+
+
+class GovernanceReuseTests(KnowledgeCardTestCase):
+    def test_self_approval_is_rejected_by_existing_governance(self):
+        # AC-03 / AC-43：提议人不得自批——沿用既有 release() 的守卫
+        draft = self.propose()
+        with self.assertRaises(PermissionError) as ctx:
+            self.publish(draft["id"], "demo-manager")
+        self.assertIn("独立审核人", str(ctx.exception))
+
+    def test_publish_still_requires_a_passing_evaluation(self):
+        # 既有评测门禁对新卡片同样生效：没有评测就不能发布
+        draft = self.propose()
+        with store.transaction(self.db_path) as db:
+            with self.assertRaises(store.Conflict) as ctx:
+                cards.publish(db, draft["id"], "demo-reviewer")
+            self.assertIn("评测", str(ctx.exception))
+
+    def test_reproposing_the_same_version_updates_the_same_draft(self):
+        # 草稿可反复修订：同 id@version 仍是同一草稿，不会产生第二份
+        first = self.propose(rule_body(id="corporate.versioned"))
+        second = self.propose(rule_body(id="corporate.versioned", name="改过的名字"))
+        self.assertEqual(first["id"], second["id"])
+        self.assertEqual(second["name"], "改过的名字")
+        with store.transaction(self.db_path) as db:
+            self.assertEqual(len([r for r in store.listing(db, "component_draft")
+                                  if r.get("component_id") == "corporate.versioned"]), 1)
+
+    def test_published_version_cannot_be_redrafted_at_the_same_version(self):
+        # AC-43：已发布编辑必须用新版本号，否则被既有治理拒绝
+        self.propose(rule_body(id="corporate.versioned"))
+        with store.transaction(self.db_path) as db:
+            draft = store.get(db, "component_draft", "corporate.versioned@1.0.0")
+            row = dict(draft, status="published", approved_by="demo-reviewer",
+                       component_id="corporate.versioned")
+            row.pop("revision", None)
+            store.put(db, "component_version", row, immutable=True)
+        with self.assertRaises(store.Conflict) as ctx:
+            self.propose(rule_body(id="corporate.versioned"))
+        self.assertIn("请使用新版本号", str(ctx.exception))
+        # 换版本号即可继续演进
+        bumped = self.propose(rule_body(id="corporate.versioned", version="1.0.1"))
+        self.assertTrue(bumped["id"].endswith("@1.0.1"))
+
+    def test_propose_never_publishes_directly(self):
+        draft = self.propose()
+        self.assertEqual(draft["status"], "draft")
+        with store.transaction(self.db_path) as db:
+            published = [row for row in store.listing(db, "component_version")
+                         if row.get("component_id") == "corporate.test_rule"]
+        self.assertEqual(published, [], "提议不得直接产生已发布版本")
+
+
+class EffectiveFilterTests(KnowledgeCardTestCase):
+    def test_only_published_and_matching_domain_are_returned(self):
+        self.propose(rule_body(id="corporate.demo_only", scope="demo"))
+        self.propose(rule_body(id="corporate.prod_only", scope="production"))
+        with store.transaction(self.db_path) as db:
+            # 未发布 → 不返回
+            self.assertEqual(cards.effective(db, "demo"), [])
+            # 手工把草稿标记为已发布以验证域过滤（发布路径本身由上面几个类覆盖）
+            for draft in store.listing(db, "component_draft"):
+                row = dict(draft, status="published", approved_by="demo-reviewer",
+                           component_id=draft.get("component_id"))
+                row.pop("revision", None)
+                store.put(db, "component_version", row, immutable=True)
+            demo = cards.effective(db, "demo")
+            production = cards.effective(db, "production")
+        self.assertTrue(demo)
+        self.assertTrue(all(card["data_domain"] == "demo" for card in demo))
+        self.assertTrue(all(card["data_domain"] == "production" for card in production))
+
+    def test_global_seed_components_are_not_mistakable_for_project_cards(self):
+        """内置种子组件是全局配置，不是项目知识卡片——必须明确报错而不是含糊通过。"""
+        for item in registry.seed_components():
+            body = registry.normalize(dict(item, status="published"), "system-demo")
+            with self.subTest(component=item["id"]):
+                with self.assertRaises(ValueError) as ctx:
+                    cards._project(body)
+                self.assertIn("不是项目知识卡片", str(ctx.exception))
+
+
+if __name__ == "__main__":
+    unittest.main()