feat: add Playwright test agents system — interactive recorder CLI, AI agents, and codegen transform

Three integrated systems for AI-assisted browser test creation:

1. comfy-test CLI (tools/test-recorder/)
   - Interactive 7-step recording flow for QA testers and non-developers
   - Environment checks with platform-specific install guidance
   - Codegen-to-convention transform engine
   - PR creation via gh CLI or manual GitHub web UI instructions
   - Commands: record, transform, check, list

2. Playwright AI agents (.claude/agents/)
   - Planner, generator, and healer agents patched with ComfyUI context
   - Regeneration scripts for Playwright updates (scripts/update-playwright-agents.sh)
   - MCP server config (.mcp.json) for agent browser interaction
   - Seed test and specs directory for agent-generated tests

3. Codegen transform skill (.claude/skills/codegen-transform/)
   - Transform rules: @playwright/test → comfyPageFixture, page → comfyPage,
     remove goto, canvas locators, waitForTimeout → nextFrame
   - Structural transforms: wrap in describe with tags, add afterEach cleanup
   - Fixture API reference and before/after examples

tools/test-recorder/src/checks/python.ts

@@ -0,0 +1,39 @@
+import { execSync } from 'node:child_process'
+import { detectPlatform } from './platform'
+import { pass, fail, info } from '../ui/logger'
+import type { CheckResult } from './types'
+
+export async function checkPython(): Promise<CheckResult> {
+  for (const cmd of ['python3', 'python']) {
+    try {
+      const version = execSync(`${cmd} --version`, { encoding: 'utf-8' }).trim()
+      pass('Python', version)
+      return { name: 'Python', ok: true, version }
+    } catch {
+      continue
+    }
+  }
+
+  fail('Python 3', 'not installed')
+  const platform = detectPlatform()
+  const instructions =
+    platform === 'macos'
+      ? [
+          'Python 3 is needed for the ComfyUI backend.',
+          '',
+          '  brew install python3',
+          '',
+          'Or download from: https://www.python.org/downloads/'
+        ]
+      : platform === 'windows'
+        ? [
+            'Download Python from: https://www.python.org/downloads/',
+            'Check "Add Python to PATH" during install.'
+          ]
+        : [
+            '  sudo apt install python3    # Debian/Ubuntu',
+            '  sudo dnf install python3    # Fedora'
+          ]
+  info(instructions)
+  return { name: 'Python 3', ok: false, installInstructions: instructions }
+}