[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/services/test_git_lock_cleanup.py

@@ -1,14 +1,6 @@
-"""F019 — a git mutation op killed by ``_run_git``'s timeout orphans lock files.
-
-``subprocess.run(..., timeout=...)`` sends SIGKILL on timeout. A git mutation
-(commit / merge --ff-only / rebase / reset --hard / add) killed mid-write
-orphaned ``.git/index.lock`` (+ ``HEAD.lock`` / ``refs/**.lock`` /
-``packed-refs.lock``), wedging the workspace for every subsequent op —
-including the next fresh-claim ``reset --hard`` — with
-"Another git process seems to be running in this repository". The fix
-best-effort removes stale ``.git/**/*.lock`` files in the timeout branch
-before re-raising, since the git process is dead by the time the timeout
-fires.
+"""A git mutation op killed by ``_run_git``'s timeout best-effort removes
+orphaned ``.git/**/*.lock`` files before re-raising — the SIGKILL'd git
+process can't clean up itself, and the locks wedge every subsequent op.
 """
 
 from __future__ import annotations