feat(daemon): event-driven convoy completion check (hq-5kmkl)

Add ConvoyWatcher that monitors bd activity for issue closes and
triggers convoy completion checks immediately rather than waiting
for patrol.

- Watch bd activity --follow --town --json for status=closed events
- Query SQLite for convoys tracking the closed issue
- Trigger gt convoy check when tracked issue closes
- Convoys close within seconds of last issue closing

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

internal/daemon/daemon.go

@@ -37,12 +37,13 @@ import (
 // This is recovery-focused: normal wake is handled by feed subscription (bd activity --follow).
 // The daemon is the safety net for dead sessions, GUPP violations, and orphaned work.
 type Daemon struct {
-	config  *Config
-	tmux    *tmux.Tmux
-	logger  *log.Logger
-	ctx     context.Context
-	cancel  context.CancelFunc
-	curator *feed.Curator
+	config        *Config
+	tmux          *tmux.Tmux
+	logger        *log.Logger
+	ctx           context.Context
+	cancel        context.CancelFunc
+	curator       *feed.Curator
+	convoyWatcher *ConvoyWatcher
 
 	// Mass death detection: track recent session deaths
 	deathsMu     sync.Mutex
@@ -143,6 +144,14 @@ func (d *Daemon) Run() error {
 		d.logger.Println("Feed curator started")
 	}
 
+	// Start convoy watcher for event-driven convoy completion
+	d.convoyWatcher = NewConvoyWatcher(d.config.TownRoot, d.logger.Printf)
+	if err := d.convoyWatcher.Start(); err != nil {
+		d.logger.Printf("Warning: failed to start convoy watcher: %v", err)
+	} else {
+		d.logger.Println("Convoy watcher started")
+	}
+
 	// Initial heartbeat
 	d.heartbeat(state)
 
@@ -579,6 +588,12 @@ func (d *Daemon) shutdown(state *State) error { //nolint:unparam // error return
 		d.logger.Println("Feed curator stopped")
 	}
 
+	// Stop convoy watcher
+	if d.convoyWatcher != nil {
+		d.convoyWatcher.Stop()
+		d.logger.Println("Convoy watcher stopped")
+	}
+
 	state.Running = false
 	if err := SaveState(d.config.TownRoot, state); err != nil {
 		d.logger.Printf("Warning: failed to save final state: %v", err)