Configure beads sync branch and ignore artifacts

.beads/.gitignore

@@ -11,6 +11,12 @@ daemon.log
 daemon.pid
 bd.sock
 sync-state.json
+.sync.lock
+last-touched
+sync_base.jsonl
+.sync.lock
+last-touched
+sync_base.jsonl
 
 # Local version tracking (prevents upgrade notification spam after git ops)
 .local_version

.beads/config.yaml

@@ -42,7 +42,7 @@
 # This setting persists across clones (unlike database config which is gitignored).
 # Can also use BEADS_SYNC_BRANCH env var for local override.
 # If not set, bd sync will require you to run 'bd config set sync.branch <branch>'.
-# sync-branch: "beads-sync"
+sync-branch: "beads-sync"
 
 # Multi-repo configuration (experimental - bd-307)
 # Allows hydrating from multiple repositories and routing writes to the correct JSONL