feat(content): obligate role note sections like journals

Completes the note(scope='handoff') write-path (WIP 23e6ee57): every role
with a dedicated note section is now obligated to populate it, the same way
journals are obligated.

Obligations (foundation.policy.tracing):
- DEV_NOTES / PR_REVIEWER_NOTES / QUICK_CONTEXT_MIN_CHARS requirements +
  checkers, wired onto i_am_done (dev_notes), delegate (quick_context), and
  pr_pass / pr_fail / post_pr_review (pr_reviewer_notes).
- Fixes a latent bug: the docs-notes checker read dev_notes instead of
  doc_notes (the documenter's section); the i_documented shim now feeds
  doc_notes to match.

Auditor: a session-scoped note obligation on i_am_idle — the auditor owns no
delivery task and has no delivery verb, so it must have recorded an
observation within the window before going idle (JournalService.has_recent_entry).

Write-then-gate: persisted sections (dev_notes / quick_context) are
pre-written by the agent's note(scope='handoff') before the gated verb;
argument-borne sections (doc_notes / pr_reviewer_notes) are checked through a
SimpleNamespace shim, the same pattern qa_notes already uses.

Config: dev/pr_reviewer/quick_context min-chars (40/40/30), panel-tunable.
Plus per-gap remediation hints and full coverage (write-path routing,
ownership, validation->remediation, each obligation, the doc_notes fix).

Full make-quality green: 9777 passed, 95.6% coverage.

tests/integration/v1/test_full_pending_to_completed.py

@@ -173,18 +173,14 @@ class _MockContentActions:
         *,
         agent_id: object,
         text: object,
-        scope: str = "note",
-        task_id: object = None,
-        structured: object = None,
+        **_kwargs: object,
     ) -> Envelope:
-        # `structured` mirrors the Wave 2 G4 production signature (panel
-        # decision/reflect fields). The mock ignores it — the test asserts
-        # lifecycle transitions, not journal-entry rendering.
+        # The route forwards scope / task_id / structured / section as keyword
+        # args; the stub absorbs them via **_kwargs (it asserts lifecycle
+        # transitions, not journal-entry / section rendering). ``section``
+        # mirrors the note(scope='handoff') write-path signature.
         _ = agent_id
         _ = text
-        _ = scope
-        _ = task_id
-        _ = structured
         return Envelope.ok(status="noted", task_id=None, next="continue")