feat: @uncaged/workflow-role-committer + @uncaged/workflow-role-reviewer

- Committer: git add/commit/push with LLM-generated branch+message
- Reviewer: code review role with approval meta
- Both use zod@4 schemas, no nerve-core deps
- 98 tests pass, biome clean

Closes #12
小橘 <xiaoju@shazhou.work>

packages/workflow-role-reviewer/package.json

@@ -0,0 +1,16 @@
+{
+  "name": "@uncaged/workflow-role-reviewer",
+  "version": "0.1.0",
+  "type": "module",
+  "main": "src/index.ts",
+  "types": "src/index.ts",
+  "scripts": {
+    "build": "echo 'TODO'",
+    "test": "bun test"
+  },
+  "dependencies": {
+    "@uncaged/workflow": "workspace:*",
+    "@uncaged/workflow-role-llm": "workspace:*",
+    "zod": "^4.0.0"
+  }
+}