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/unit/gateway/test_pm_decision_window.py

@@ -89,10 +89,16 @@ def _make_deps(**overrides: Any) -> ChoreographerDeps:
 def _make_task(task_id: Any) -> Any:
     """A task stub that the tracing gate accepts as-is.
 
-    `_check_pm_decision_required` only consults the (agent, task) journal
-    lookup — the task object itself is opaque to that check.
+    `_check_pm_decision_required` consults the (agent, task) journal lookup
+    for the decision window and, for ``delegate``, the persisted
+    ``quick_context`` resumption section — so the stub carries a substantive
+    quick_context to satisfy that obligation.
     """
-    return MagicMock(id=task_id, status="in_progress")
+    return MagicMock(
+        id=task_id,
+        status="in_progress",
+        quick_context="Decomposition planned; cells implement their slice next.",
+    )
 
 
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