refactor: remove unused bd pin/unpin/hook commands (bd-x0zl)

Analysis found these commands are dead code:
- gt never calls `bd pin` - uses `bd update --status=pinned` instead
- Beads.Pin() wrapper exists but is never called
- bd hook functionality duplicated by gt mol status
- Code comment says "pinned field is cosmetic for bd hook visibility"

Removed:
- cmd/bd/pin.go
- cmd/bd/unpin.go
- cmd/bd/hook.go

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

cmd/bd/daemon.go

@@ -355,6 +355,11 @@ func runDaemonLoop(interval time.Duration, autoCommit, autoPush, autoPull, local
 
 	// Check for multiple .db files (ambiguity error)
 	beadsDir := filepath.Dir(daemonDBPath)
+
+	// Reset backoff on daemon start (fresh start, but preserve NeedsManualSync hint)
+	if !localMode {
+		ResetBackoffOnDaemonStart(beadsDir)
+	}
 	matches, err := filepath.Glob(filepath.Join(beadsDir, "*.db"))
 	if err == nil && len(matches) > 1 {
 		// Filter out backup files (*.backup-*.db, *.backup.db)