Rebuild DB from JSONL after corruption cleanup

- Database had 72 duplicate issues from incomplete migration
- Sequential IDs (no content_hash) mixed with hash IDs
- Removed corrupt DB, rebuilt from JSONL (source of truth)
- 225 → 153 issues (duplicates eliminated)
- Updated config.json version to 0.20.1

.beads/config.json

@@ -1,5 +1,5 @@
 {
   "database": "beads.db",
-  "version": "0.19.1",
+  "version": "0.20.1",
   "jsonl_export": "beads.jsonl"
 }