refactor: move llmExtract, extractMeta, buildDescriptor, types to workflow-util-role

workflow-role-llm now only contains LLM-as-agent specifics:
  - createRole (wires agent + extract)
  - createLlmAdapter (OpenAI chat completions agent)

workflow-util-role now provides all role infrastructure:
  - decorators (decorateRole, withDryRun, onFail)
  - llmExtract / extractMetaOrThrow (structured extraction)
  - buildDescriptorFromRoles (zod → JSON Schema)
  - LlmProvider, LlmMessage types

packages/workflow-role-committer/src/committer.ts

@@ -1,7 +1,11 @@
 import type { AgentFn, Role, RoleResult, ThreadContext } from "@uncaged/workflow";
-import type { LlmProvider } from "@uncaged/workflow-role-llm";
-import { extractMetaOrThrow } from "@uncaged/workflow-role-llm";
-import { decorateRole, onFail, withDryRun } from "@uncaged/workflow-util-role";
+import {
+  decorateRole,
+  extractMetaOrThrow,
+  type LlmProvider,
+  onFail,
+  withDryRun,
+} from "@uncaged/workflow-util-role";
 import * as z from "zod/v4";
 
 import { gitExec } from "./git-exec.js";