Add crsql changes metadata status

AGENTS.md

@@ -119,8 +119,9 @@ Roadmap items should be actionable and checkable:
 - Local CAS supports pin/unpin metadata, surfaced through `cas list`, and
   `cas cleanup` evicts unpinned blobs while retaining pinned blobs.
 - DB resources can be registered locally and report local-only status plus a
-  read-only SQLite schema summary/hash. cr-sqlite loading, change extraction,
-  and sync are still roadmap work.
+  read-only SQLite schema summary/hash and `crsql_changes` metadata when
+  present. cr-sqlite loading, typed change extraction, and sync are still
+  roadmap work.
 - KV stores support local SQLite-backed create/set/get. Iroh Documents
   replication and command-level prefix-capability enforcement are still roadmap
   work. The auth evaluator already understands `kv.write_prefix:<prefix>`