Add live variant mode: element picker, action panel, poll/reply bridge (22 commands)

New feature: /impeccable live starts an interactive visual iteration server.
Users select elements in the browser, pick a design action (bolder, quieter,
etc.), and the agent generates HTML+CSS variants written directly to source.
The dev server's HMR hot-swaps them in, and MutationObserver progressively
reveals each variant in a cycler UI as it arrives.

Architecture:
- src/live/server.mjs: HTTP + WebSocket server with session token auth,
  long-poll /poll endpoint for the agent, WebSocket for the browser
- src/live/poll.mjs: CLI client (npx impeccable poll / poll --reply)
- src/live/browser.js: element picker with keyboard nav (arrows=siblings,
  shift+arrows=parent/child), action panel (12 commands, freeform input,
  variant count), variant cycler with progressive reveal via MutationObserver
- src/live/protocol.mjs: shared message types and event validation
- source/skills/impeccable/reference/live.md: agent loop instructions
  (inject script, poll loop, generate variants, accept/discard, cleanup)

CLI changes:
- bin/cli.js: added "poll" top-level command
- src/detect-antipatterns.mjs: liveCli() now delegates to src/live/server.mjs
- package.json: added ws dependency

Registered /impeccable live as command #22 across all standard locations.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

bin/cli.js

@@ -24,8 +24,10 @@ if (!command || command === '--help' || command === '-h') {
 
 Commands:
   detect [file-or-dir-or-url...]   Scan for UI anti-patterns and design quality issues
-  live [--port=PORT]               Start browser detection overlay server
+  live [--port=PORT]               Start live variant server (element picker + variant cycling)
   live stop                        Stop a running live server
+  poll                             Wait for a browser event from the live server
+  poll --reply <id> <status>       Reply to a pending event (done, error)
   skills help                      List all available skills and commands
   skills install                   Install impeccable skills into your project
   skills update                    Update skills to the latest version
@@ -53,6 +55,10 @@ if (command === 'detect') {
   process.argv = [process.argv[0], process.argv[1], ...args.slice(1)];
   const { liveCli } = await import('../src/detect-antipatterns.mjs');
   await liveCli();
+} else if (command === 'poll') {
+  process.argv = [process.argv[0], process.argv[1], ...args.slice(1)];
+  const { pollCli } = await import('../src/live/poll.mjs');
+  await pollCli();
 } else if (command === 'skills') {
   const { run } = await import('./commands/skills.mjs');
   await run(args.slice(1));