[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_readopt_running_agents.py

@@ -82,11 +82,8 @@ async def test_readopt_swallows_probe_errors() -> None:
 
 @pytest.mark.asyncio
 async def test_readopt_records_container_id_so_health_check_can_see_exit() -> None:
-    # F033: a re-adopted instance registered with container_id=None is skipped by
-    # _check_health (`if instance.container_id is None: continue`), so when the
-    # container later exits the stopped-container handler never runs — the task
-    # is stranded under a phantom ACTIVE instance forever. Re-adopt must capture
-    # the real container id so the health loop can observe the later exit.
+    # Re-adopt must capture the real container id; a None container_id is skipped
+    # by _check_health, stranding the task under a phantom ACTIVE instance.
     orch = _orch()
     orch._inspect_container_state = AsyncMock(return_value=(True, 0))
     orch._resolve_container_id = AsyncMock(return_value="deadbeef1234")