feat(protocol): add AdapterFn/RoleFn/AdapterBinding, refactor createWorkflow to use AdapterBinding (#222)

- Add RoleFn<T>, AdapterFn, AdapterBinding types to workflow-protocol
- Mark AgentFn, AgentFnResult, AgentBinding as @deprecated
- Refactor createWorkflow to accept AdapterBinding instead of AgentBinding
- Adapter returns typed meta directly — no more extract call in workflow loop
- Add buildThreadInput (ThreadContext-based), keep buildAgentPrompt as deprecated wrapper
- Update template bundle-entries to wrap AgentFn as AdapterFn
- Update solve-issue tests to use AdapterFn directly

packages/workflow-template-develop/bundle-entry.ts

@@ -4,7 +4,10 @@
  * All roles use cursor-agent with workspace auto-extracted from context.
  */
 import { createCursorAgent } from "@uncaged/workflow-agent-cursor";
+import { putContentNodeWithRefs } from "@uncaged/workflow-cas";
+import type { AdapterFn, AgentContext, AgentFnResult, ThreadContext, WorkflowRuntime } from "@uncaged/workflow-runtime";
 import { createWorkflow } from "@uncaged/workflow-runtime";
+import type * as z from "zod/v4";
 import { buildDevelopDescriptor, developWorkflowDefinition } from "./src/index.js";
 
 function requireEnv(name: string): string {
@@ -40,7 +43,22 @@ const agent = createCursorAgent({
   llmProvider,
 });
 
-const wf = createWorkflow(developWorkflowDefinition, { agent, overrides: null });
+function wrapAgentAsAdapter(agentFn: (ctx: AgentContext) => Promise<AgentFnResult>): AdapterFn {
+  return <T>(prompt: string, schema: z.ZodType<T>) => {
+    return async (ctx: ThreadContext, runtime: WorkflowRuntime): Promise<T> => {
+      const agentCtx: AgentContext = { ...ctx, currentRole: { name: "agent", systemPrompt: prompt } };
+      const result = await agentFn(agentCtx);
+      const output = typeof result === "string" ? result : result.output;
+      const contentHash = await putContentNodeWithRefs(runtime.cas, output, []);
+      const extracted = await runtime.extract(schema as z.ZodType<Record<string, unknown>>, contentHash);
+      return extracted.meta as T;
+    };
+  };
+}
+
+const adapter = wrapAgentAsAdapter(agent);
+
+const wf = createWorkflow(developWorkflowDefinition, { adapter, overrides: null });
 
 export const descriptor = buildDevelopDescriptor();
 export const run = wf;