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_guidance_ownership.py

@@ -270,6 +270,15 @@ TOPICS: tuple[Topic, ...] = (
     Topic("a record you only cite still gets read",
           "skill:reporting-back", ("next_step", "only mention"),
           "a record you only mention is a record to read"),
+    # Milestone 463 step 6: family canon — when an idea is evaluated, how a
+    # project answers one, what a reason is, and the conflict order's reflex.
+    # The criteria, outcomes and grounds themselves are product text on the
+    # tools that enforce them; the skill owns when and how.
+    Topic("family canon: evaluate on a hint, answer in order, a reason is a fact",
+          "skill:family-canon",
+          ("family_hint", "get_family_adoption", "resolve_family_conflict", "precedent"),
+          "write the reason so a session in another project can tell whether the same fact holds there",
+          index=("family-canon",)),
     # ── per-tool contracts and in-band behaviour — owned by the server ──
     Topic("closing a task cues the report", "docstrings", ("report_back",), "reporting this to the operator?"),
     # The agent is the judge (#4208). Two topics, not one, because they fire