fix(sync,blocked): add safety guards for issue deletion and include status=blocked in bd blocked

GH#464: Add safety guards to prevent deletion of open/in_progress issues during sync:
- Safety guard in git-history-backfill (importer.go)
- Safety guard in deletions manifest processing
- Warning when uncommitted changes detected before pull (daemon_sync.go)
- Enhanced repo ID mismatch error message

GH#545: Fix bd blocked to show status=blocked issues (sqlite/ready.go):
- Changed from INNER JOIN to LEFT JOIN to include issues without dependencies
- Added WHERE clause to include both status=blocked AND dependency-blocked issues

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

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

cmd/bd/daemon_sync.go

@@ -359,12 +359,16 @@ This usually means:
   3. Database corruption
   4. bd was upgraded and URL canonicalization changed
 
+⚠️  CRITICAL: This mismatch can cause beads to incorrectly delete issues during sync!
+   The git-history-backfill mechanism may treat your local issues as deleted
+   because they don't exist in the remote repository's history.
+
 Solutions:
   - If remote URL changed: bd migrate --update-repo-id
   - If bd was upgraded: bd migrate --update-repo-id
   - If wrong database: rm -rf .beads && bd init
   - If correct database: BEADS_IGNORE_REPO_MISMATCH=1 bd daemon
-    (Warning: This can cause data corruption across clones!)
+    (Warning: This can cause data corruption and unwanted deletions across clones!)
 `, storedRepoID[:8], currentRepoID[:8])
 	}
 
@@ -558,6 +562,18 @@ func performAutoImport(ctx context.Context, store storage.Storage, skipGit bool,
 
 		// Pull from git if not in git-free mode
 		if !skipGit {
+			// SAFETY CHECK (bd-k92d): Warn if there are uncommitted local changes
+			// This helps detect race conditions where local work hasn't been pushed yet
+			jsonlPath := findJSONLPath()
+			if jsonlPath != "" {
+				if hasLocalChanges, err := gitHasChanges(importCtx, jsonlPath); err == nil && hasLocalChanges {
+					log.log("⚠️  WARNING: Uncommitted local changes detected in %s", jsonlPath)
+					log.log("   Pulling from remote may overwrite local unpushed changes.")
+					log.log("   Consider running 'bd sync' to commit and push your changes first.")
+					// Continue anyway, but user has been warned
+				}
+			}
+
 			// Try sync branch first
 			pulled, err := syncBranchPull(importCtx, store, log)
 			if err != nil {