Add local CAS file roots

AGENTS.md

@@ -119,8 +119,10 @@ 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.
 - The CAS crate can build deterministic tree objects for local file trees and
-  store those manifests as CAS blobs. File roots, scan workflows, and sync
-  conflict handling are still roadmap work.
+  store those manifests as CAS blobs. The daemon can register and scan local
+  file roots, reporting create/update/delete/rename changes without writing back
+  to the working tree. Cross-node file sync and conflict handling are still
+  roadmap work.
 - DB resources can be registered locally and report local-only status plus a
   read-only SQLite schema summary/hash and `crsql_changes` metadata when
   present. The DB crate and daemon can extract typed read-only `crsql_changes`