[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/test_notification_dedup.py

@@ -75,12 +75,11 @@ async def test_create_notification_suppresses_same_purpose_duplicate() -> None:
 
 @pytest.mark.asyncio
 async def test_informational_knowledge_share_not_deduped() -> None:
-    """F010: KNOWLEDGE_SHARE (informational, requires_ack=False) must NOT be
-    deduped. Each learning broadcast carries distinct content (a new learning);
-    a recipient who never acks the prior one (acking is voluntary for
-    informational types) would permanently suppress every subsequent
-    knowledge-share from the same sender → silent learning-broadcast data loss.
-    The dedup's anti-loop rationale only applies to action-required types."""
+    """KNOWLEDGE_SHARE (informational, requires_ack=False) must NOT be deduped:
+    a recipient who never acks the prior one would permanently suppress every
+    subsequent knowledge-share from the same sender → silent learning-broadcast
+    data loss. The dedup's anti-loop rationale only applies to action-required
+    types."""
     db = MagicMock()
     # A same-purpose unacked KNOWLEDGE_SHARE prior exists — but it must NOT
     # suppress the new one.