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/src/store.ts

@@ -3,8 +3,8 @@ import { access, appendFile, mkdir, readdir, readFile, writeFile } from "node:fs
 import { homedir } from "node:os";
 import { join } from "node:path";
 
-import type { BootstrapCapableStore, Hash } from "@uncaged/json-cas";
-import { createFsStore } from "@uncaged/json-cas-fs";
+import type { BootstrapCapableStore, Hash } from "@ocas/core";
+import { createFsStore } from "@ocas/fs";
 import type { CasRef, ThreadId, ThreadListItem, ThreadsIndex } from "@uncaged/workflow-protocol";
 import { parse, stringify } from "yaml";