feat: daemon self-update with version mismatch detection

[vreshch]

Summary

• Adds agentage update command that checks npm for latest version, installs it, and restarts the daemon
• Auto-detects version mismatch between CLI and running daemon on every command — restarts stale daemon automatically
• Shows "Update available" notice after CLI commands (npm check cached 24h)
• Sends daemonVersion in heartbeat payload so hub always knows the running version
• Lock file prevents concurrent update attempts

Changes

File	Change
src/utils/update-checker.ts	New — npm registry query + 24h cache + version comparison
src/commands/update.ts	New — agentage update / agentage update --check
src/utils/ensure-daemon.ts	Version mismatch detection → auto-restart
src/cli.ts	Register update command + background update check notice
src/hub/hub-sync.ts	Send daemonVersion in heartbeat
src/hub/hub-client.ts	Updated heartbeat type with daemonVersion + latestCliVersion response

Companion PR

• agentage/web — dashboard "update available" badge + /api/cli/latest endpoint

Test plan

• All 333 existing tests pass
• 7 new tests for update-checker (cache TTL, version comparison, network failure)
• Type-check clean
• Build succeeds
• Manual: agentage update --check shows version info
• Manual: version mismatch triggers daemon restart

[github-actions]

🎉 PR Validation ✅ PASSED

Commit: 0d634542704646f62e646bc3e3f954829c60f0f5
Branch: feature/daemon-self-update

Checks:

• ✅ Release guard (no version/changelog changes)
• ✅ Dependencies installed
• ✅ Type check passed
• ✅ Linting passed
• ✅ Format check passed
• ✅ Tests + coverage passed
• ✅ Build successful

Ready to merge! ✨

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⏰ Generated at: 2026-03-29T11:27:48.910Z