[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_conventions_pr_dirty.py

@@ -1,15 +1,6 @@
-"""F051: open_conventions_pr must not operate on a dirty working tree.
-
-``open_conventions_pr`` cuts its scaffold branch in an agent's clone (or the
-project's shared ``workspace_path``). It does ``checkout <base>`` with
-``check=False`` and then ``checkout -B <scaffold>``. On a dirty tree the
-``checkout <base>`` either no-ops (already on base) or is refused and silently
-swallowed; ``checkout -B <scaffold>`` then carries the agent's uncommitted
-work onto the scaffold branch, and the ``commit`` sweeps it into the
-project-level conventions commit — the agent's in-progress change is gone
-from their working tree and rides a PR they never intended. Refuse a dirty
-tree up front (return None, no checkout) so an active workspace is never
-touched.
+"""``open_conventions_pr`` refuses a dirty working tree up front (returns
+None, no checkout) so an active agent workspace is never swept into a
+project-level conventions commit.
 """
 
 from __future__ import annotations