Update .beads metadata after sync

Amp-Thread-ID: https://ampcode.com/threads/T-d089540c-c172-440f-88c9-ff06bde6504d
Co-authored-by: Amp <amp@ampcode.com>

.beads/config.yaml

@@ -11,7 +11,7 @@
 # Use no-db mode: load from JSONL, no SQLite, write back after each command
 # When true, bd will use .beads/issues.jsonl as the source of truth
 # instead of SQLite database
-no-db: false
+# no-db: false
 
 # Disable daemon for RPC communication (forces direct database access)
 # no-daemon: false
@@ -45,3 +45,4 @@ no-db: false
 # - linear.api-key
 # - github.org
 # - github.repo
+# - sync.branch - Git branch for beads commits (use BEADS_SYNC_BRANCH env var or bd config set)

.beads/metadata.json

@@ -1,5 +1,5 @@
 {
   "database": "beads.db",
-  "version": "0.21.7",
+  "version": "0.21.6",
   "jsonl_export": "beads.jsonl"
 }