feat: add plan2code-bot with --resume capability and state cleanup

Add the autonomous workflow test runner (plan2code-bot) that uses the
Claude Agent SDK to run plan2code end-to-end. Includes --resume flag
to continue incomplete runs from saved state, and automatic state file
cleanup on successful completion.

plan2code-bot/src/session-runner.test.ts

@@ -0,0 +1,74 @@
+import { describe, it, expect, vi } from 'vitest';
+
+// Mock the SDK before importing session-runner
+vi.mock('@anthropic-ai/claude-agent-sdk', () => ({
+  query: vi.fn(),
+}));
+
+import { query } from '@anthropic-ai/claude-agent-sdk';
+import { runSession } from './session-runner.js';
+import type { BotConfig } from './types.js';
+
+const config: BotConfig = {
+  workDir: '/tmp/work',
+  projectDir: '/tmp/work/my-app',
+  ideaDescription: 'test app',
+  ideaName: 'test-app',
+  mode: 'new-project',
+};
+
+describe('runSession', () => {
+  it('returns success: false when output is empty', async () => {
+    // Simulate a session that yields an assistant message with empty text
+    const mockQuery = vi.mocked(query);
+    mockQuery.mockReturnValue(
+      (async function* () {
+        yield {
+          type: 'assistant' as const,
+          session_id: 'sess-1',
+          message: { content: [{ type: 'text' as const, text: '' }] },
+        };
+        yield {
+          type: 'result' as const,
+          session_id: 'sess-1',
+        };
+      })() as any,
+    );
+
+    const result = await runSession({
+      prompt: 'do something',
+      config,
+      step: 'init',
+    });
+
+    expect(result.success).toBe(false);
+    expect(result.output.trim()).toBe('');
+  });
+
+  it('returns success: true when output has content', async () => {
+    const mockQuery = vi.mocked(query);
+    mockQuery.mockReturnValue(
+      (async function* () {
+        yield {
+          type: 'assistant' as const,
+          session_id: 'sess-2',
+          message: { content: [{ type: 'text' as const, text: 'AGENTS.md has been created successfully' }] },
+        };
+        yield {
+          type: 'result' as const,
+          session_id: 'sess-2',
+        };
+      })() as any,
+    );
+
+    const result = await runSession({
+      prompt: 'do something',
+      config,
+      step: 'init',
+    });
+
+    expect(result.success).toBe(true);
+    expect(result.output).toContain('AGENTS.md');
+    expect(result.sessionId).toBe('sess-2');
+  });
+});