release(v4.9.4): the audit log follows a moved registry (Issue #57, PR #58) - archive the review reports and bump the lockstep version

Review loop (--review-only, --all-reviewer, focused on this Mac:
macOS, /usr/bin/python3 3.9.6, bash 3.2): round 1 (@63d8164) agy and
grok PASS, claude and codex NOT PASS (F1 paho via the /usr/bin/python3
fallback, F2 logs default path, R1 disk-fallback redispatch
interleaving, R2 symlinked registry), sent as a PR comment and fixed by
the author in four commits; round 2 (@a7cb90e) 4/4 PASS.

Full suite on macOS / Python 3.9.6 @a7cb90e: 1867 passed, 56 skipped,
1 error (the known #55 false positive: WAL/SHM of an agy conversation
running in another workspace). Real herdr panes and ~/.claude/projects
unchanged.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01VCgu9Fa9iT7TbJUSzdq4Ff

README.md

@@ -2,7 +2,7 @@
 
 A **Multi-Agent Orchestration & Messaging Backplane** built on [herdr](https://herdr.dev) and MQTT. It runs long-lived coding agents (`claude`, `agy`, `hermes`, `grok`, `opencode`, `codex`) in isolated herdr panes, delegates work to them as tracked jobs, and drives planner / creator / reviewer loops until every reviewer passes the change.
 
-[![Version: v4.9.3](https://img.shields.io/badge/version-v4.9.3-blue.svg)](VERSIONS.md)
+[![Version: v4.9.4](https://img.shields.io/badge/version-v4.9.4-blue.svg)](VERSIONS.md)
 
 ---