feat(family): family canon reaches the session - entry readout, retrieval reach, skill, report cue (milestone 463 step 6, #4992)

- enter_project carries a `family` key, but only when the project has
  something to answer: counts of unassessed, owed and to-recheck answers,
  each with the list_family_adoptions call that lists it. It shows on every
  entry, never by platform touch: entry is when work is chosen, and an
  unanswered idea is otherwise invisible.
- Retrieval: a widened project search (include_global_kinds) now also
  reaches the canon ideas on the project's platforms. It also reaches their
  references in the project's languages, or all of them when none matches.
  An off-platform project gets none, and the plain project filter (the
  duplicate gate) is unchanged.
- Closing a task returns `family_owed`, the owed answers filed while it was
  open, and the report cue asks for them to be named.
- New plugin skill family-canon (moment work.record) covers when to
  evaluate a promotion, answering in order, what counts as a reason, the
  precedent reflex and the conflict order. _INSTRUCTIONS, create_note,
  create_snippet, classify_shapes and reporting-back point at it.
  The plugin version is minted.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/test_mcp_tool_projects.py

@@ -1,4 +1,5 @@
 """Tests for fable_*_project tools."""
+import contextlib
 from unittest.mock import AsyncMock, MagicMock, patch
 
 import pytest
@@ -48,6 +49,16 @@ def _no_coverage():
         yield
 
 
+@pytest.fixture(autouse=True)
+def _no_family():
+    """enter_project reads the family-canon readout (milestone 463 step 6) —
+    no database here, so the common case is stubbed: nothing to answer. The
+    populated key is asserted in its own test below."""
+    with patch("scribe.mcp.tools.projects.family_adoption_svc.family_readout",
+               AsyncMock(return_value=None)) as mock:
+        yield mock
+
+
 @pytest.fixture(autouse=True)
 def _no_background_seed():
     """enter_project now fire-and-forgets a coverage self-seed (#2802). These
@@ -483,3 +494,33 @@ def test_inception_routes_and_tool_are_registered():
     # Rules left inception with subscriptions (milestone 414).
     assert "subscribe_rulebooks" not in tool.parameters.get("properties", {})
 
+
+
+@pytest.mark.asyncio
+async def test_enter_project_carries_the_family_line_only_when_it_asks_something(_no_family):
+    """The `family` key is attached when the project has family canon to
+    answer, and absent otherwise — a key that usually says null trains
+    readers to skip it (#2483)."""
+    line = {"line": "family canon on this project's platforms: 2 unassessed",
+            "unassessed": 2, "owed": 0, "needs_recheck": 0,
+            "calls": {"unassessed": 'list_family_adoptions(project_id=5, status="unassessed")'}}
+
+    async def enter():
+        with contextlib.ExitStack() as stack:
+            for cm in _enter_project_stubs(fake_project(id=5)):
+                stack.enter_context(cm)
+            return await enter_project(project_id=5)
+
+    assert "family" not in await enter()
+    _no_family.return_value = line
+    assert (await enter())["family"] == line
+
+
+@pytest.mark.asyncio
+async def test_a_failing_family_readout_never_fails_the_handshake(_no_family):
+    _no_family.side_effect = RuntimeError("database down")
+    with contextlib.ExitStack() as stack:
+        for cm in _enter_project_stubs(fake_project(id=5)):
+            stack.enter_context(cm)
+        out = await enter_project(project_id=5)
+    assert "family" not in out and out["project"]["id"] == 5