fix: address 3 critical PR review issues

1. threads.yaml race condition: reload threads index after agent subprocess
   completes before updating head pointer (cli-uwf/commands/thread.ts)

2. evaluateJsonata not awaited: jsonata evaluate() returns Promise for async
   expressions — now properly awaited (uwf-moderator/evaluate.ts)

3. resolveWorkflowHash dead code: function always returns a value, removed
   impossible null return type and dead null-check branches at call sites
   (cli-uwf/store.ts, commands/thread.ts, commands/workflow.ts)

package.json

@@ -2,7 +2,9 @@
   "name": "@uncaged/workflow-monorepo",
   "private": true,
   "workspaces": [
-    "packages/*"
+    "packages/*",
+    "../json-cas/packages/json-cas",
+    "../json-cas/packages/json-cas-fs"
   ],
   "scripts": {
     "build": "bunx tsc --build",