chore: migrate @uncaged/json-cas to @ocas/core, @uncaged/json-cas-fs to @ocas/fs

- Replace all package.json dependencies
- Update all imports across 7 packages + scripts
- cas_ref → ocas_ref in schema definitions
- listByType() adapted for ListEntry[] return type
- Update CLAUDE.md references

Fixes #585

packages/cli-workflow/package.json

@@ -11,8 +11,8 @@
     "uwf": "./dist/cli.js"
   },
   "dependencies": {
-    "@uncaged/json-cas": "^0.5.3",
-    "@uncaged/json-cas-fs": "^0.5.3",
+    "@ocas/core": "^0.1.1",
+    "@ocas/fs": "^0.1.1",
     "@uncaged/workflow-protocol": "workspace:^",
     "@uncaged/workflow-util": "workspace:^",
     "@uncaged/workflow-util-agent": "workspace:^",