Implements automatic daemon version detection and restart when client
and daemon versions are incompatible. Eliminates need for manual
'bd daemon --stop' after upgrades.
Changes:
- Check daemon version during health check in PersistentPreRun
- Auto-restart mismatched daemon or fall back to direct mode
- Check version when starting daemon, auto-stop old daemon if incompatible
- Robust restart logic: sets working dir, cleans stale sockets, reaps processes
- Uses waitForSocketReadiness helper for reliable startup detection
- Updated AGENTS.md with version management documentation
Closes bd-89
Amp-Thread-ID: https://ampcode.com/threads/T-231a3701-c9c8-49e4-a1b0-e67c94e5c365
Co-authored-by: Amp <amp@ampcode.com>
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