feat(hooks): make template hooks sync.branch aware (bd-8ib)

Update the embedded template hooks (used by bd init) to also check
for sync.branch configuration. This complements the earlier update
to examples/git-hooks/.

Changes:
- templates/hooks/pre-push: Skip uncommitted check when sync.branch set
- templates/hooks/pre-commit: Skip flush/staging when sync.branch set
- Bump version to 0.27.1 for all hooks
- Add sync.branch hooks change to --whats-new

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

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

cmd/bd/templates/hooks/pre-commit

@@ -1,5 +1,5 @@
 #!/bin/sh
-# bd-hooks-version: 0.27.0
+# bd-hooks-version: 0.27.1
 #
 # bd (beads) pre-commit hook
 #
@@ -7,6 +7,9 @@
 # .beads/beads.jsonl before the commit is created, preventing the
 # race condition where daemon auto-flush fires after the commit.
 #
+# When sync.branch is configured, .beads changes are committed to a separate
+# branch via worktree, so auto-staging is skipped for the main branch.
+#
 # Installation:
 #   cp examples/git-hooks/pre-commit .git/hooks/pre-commit
 #   chmod +x .git/hooks/pre-commit
@@ -26,6 +29,16 @@ if [ ! -d .beads ]; then
     exit 0
 fi
 
+# Check if sync.branch is configured - if so, .beads changes go to a separate
+# branch via worktree, not the current branch
+# Use --json to get clean output (human-readable format prints "(not set)")
+SYNC_BRANCH=$(bd config get sync.branch --json 2>/dev/null | grep -o '"value": *"[^"]*"' | sed 's/"value": *"\([^"]*\)"/\1/')
+if [ -n "$SYNC_BRANCH" ]; then
+    # sync.branch is configured, skip flush and auto-staging
+    # Changes are synced to the separate branch via 'bd sync'
+    exit 0
+fi
+
 # Flush pending changes to JSONL
 # Use --flush-only to skip git operations (we're already in a git hook)
 # Suppress output unless there's an error