[sweep] strip Fxxx audit-ID tokens + trim bloated comments/docstrings + add behavior-change docs

Post-audit sweep over the 135 audit-fix commits since 19a474d3:

1. Stripped every # Fxxx: audit-ID token from comments AND every Fxxx token
   from docstring openings across 211 blocks / ~626 lines. The CEO flagged
   these twice: audit-issue IDs in code confuse future devs/agents. The
   descriptive text is preserved; only the Fxxx token is removed (and bloated
   narrative blocks trimmed to 1-3 lines keeping the one non-obvious invariant).
2. Trimmed bloated comments/docstrings to the concise standard (1-3 lines).
3. Added missing behavior-change docs for the audit-fix batch: prompts/roles
   (documenter, pr_reviewer, qa), user-facing docs (api auth, websockets,
   agent-gateway, megatask, merge-model, task-lifecycle, grok, resilience,
   conventions, panel, security, troubleshooting), and the RAG corpus (cell-pm,
   main-pm, pr-reviewer, qa roles; conventions; messaging-tools; escalation;
   megatask; task-claiming workflows).

Comment/docstring/prose ONLY — zero code-line edits (verified: the diff
contains no def/class/return/if/for/await/assignment/call lines). Gates green:
ruff format + ruff check clean, mypy clean on roboco/. The only pytest failures
are the pre-existing sync_branch tracing-decision gap (B1, 250be5c2) — not
sweep-caused and tracked separately.

tests/unit/runtime/test_blocker_and_claimed_dispatch.py

@@ -196,16 +196,9 @@ def test_in_progress_task_with_no_agent_returns_assignee() -> None:
 
 
 def test_claimed_task_with_unknown_assignee_returns_slug_for_release() -> None:
-    # F032: a claimed/in_progress task whose assignee is a stale/unknown UUID
-    # (no seeded agent) must reach the release-to-pending path. The human-only
-    # guard (role_for_slug_or_none) returns None for an unknown slug, and
-    # ``None in (CEO, PROMPTER, SECRETARY)`` is False — so it does NOT
-    # short-circuit, the slug falls through the grace window, and the resolver
-    # returns the unknown slug. _dispatch_claimed_without_agent then sees
-    # get_agent_role(slug) == "unknown" and releases the claim to pending for
-    # a role-matched reclaim. Before F031's role_for_slug_or_none fix the guard
-    # raised KeyError on the unknown slug, crashing the whole tick before the
-    # release path could run.
+    # A claimed/in_progress task whose assignee is a stale/unknown UUID (no
+    # seeded agent) must reach the release-to-pending path: the human-only guard
+    # returns None for unknown slugs, so the slug falls through and is released.
     orch = _orch()
     unknown_uuid = str(uuid4())
     task: dict[str, Any] = {