feat: @uncaged/workflow-agent-cursor + @uncaged/workflow-agent-hermes

- Cursor adapter: spawn cursor-agent CLI, auto/specified model
- Hermes adapter: spawn hermes chat CLI
- Both: AgentFn interface, no nerve-core deps, Result-based config validation
- 93 tests pass, biome clean

Closes #10, Closes #11
小橘 <xiaoju@shazhou.work>

packages/workflow-agent-hermes/__tests__/hermes-agent.test.ts

@@ -0,0 +1,55 @@
+import { describe, expect, test } from "bun:test";
+import { START, type ThreadContext } from "@uncaged/workflow";
+
+import { buildAgentPrompt, createHermesAgent, validateHermesAgentConfig } from "../src/index.js";
+
+function makeCtx(): ThreadContext {
+  return {
+    start: {
+      role: START,
+      content: "plan the migration",
+      meta: { maxRounds: 8 },
+      timestamp: 1,
+    },
+    steps: [],
+  };
+}
+
+describe("validateHermesAgentConfig", () => {
+  test("accepts valid config", () => {
+    const r = validateHermesAgentConfig({
+      model: null,
+      timeout: null,
+    });
+    expect(r.ok).toBe(true);
+  });
+
+  test("rejects negative timeout", () => {
+    const r = validateHermesAgentConfig({
+      model: null,
+      timeout: -5,
+    });
+    expect(r.ok).toBe(false);
+    if (!r.ok) {
+      expect(r.error).toContain("timeout");
+    }
+  });
+});
+
+describe("buildAgentPrompt", () => {
+  test("includes system and thread start", () => {
+    const text = buildAgentPrompt(makeCtx(), "You are a planner.");
+    expect(text).toContain("You are a planner.");
+    expect(text).toContain("plan the migration");
+  });
+});
+
+describe("createHermesAgent", () => {
+  test("returns an AgentFn", () => {
+    const agent = createHermesAgent({
+      model: null,
+      timeout: null,
+    });
+    expect(typeof agent).toBe("function");
+  });
+});