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/workflow-util-agent/src/storage.ts

@@ -2,8 +2,8 @@ import { readFile } from "node:fs/promises";
 import { homedir } from "node:os";
 import { join } from "node:path";
 
-import type { Store } from "@uncaged/json-cas";
-import { createFsStore } from "@uncaged/json-cas-fs";
+import type { Store } from "@ocas/core";
+import { createFsStore } from "@ocas/fs";
 import type {
   AgentAlias,
   AgentConfig,