chore(beads): update gitignore

Author: zainfathoni

.beads/.gitignore

@@ -11,6 +11,7 @@ daemon.log
 daemon.pid
 bd.sock
 sync-state.json
+last-touched
 
 # Local version tracking (prevents upgrade notification spam after git ops)
 .local_version
@@ -31,11 +32,13 @@ beads.left.meta.json
 beads.right.jsonl
 beads.right.meta.json
 
+# Sync state (local-only, per-machine)
+# These files are machine-specific and should not be shared across clones
+.sync.lock
+sync_base.jsonl
+
 # NOTE: Do NOT add negation patterns (e.g., !issues.jsonl) here.
 # They would override fork protection in .git/info/exclude, allowing
 # contributors to accidentally commit upstream issue databases.
 # The JSONL files (issues.jsonl, interactions.jsonl) and config files
 # are tracked by git by default since no pattern above ignores them.
-
-# Recently accessed files tracking
-last-touched