Detector architecture v2: static engine, benchmarks, lab, and visual contrast (#156)

* Add detector benchmark lab and visual contrast fallback

* Expand visual contrast fixture coverage

* Add browser visual contrast fallback

* Show visual contrast overlays in detector lab

* Fix detector lab short viewport layout

* Fix detector lab visual overlays

* Add visual contrast to browser scan overlays

* Avoid browser scroll jumps during visual contrast scans

* Resolve visual contrast lazily on scroll

* Refresh detector lab visual counts lazily

* Update pnpm lockfile for static parser deps

* Address Bugbot detector API comments

* Report extension visual contrast errors

* Refactor detector into engine modules

* Address Bugbot detector comments

* Fix latest Bugbot detector notes

* Fix visual contrast fixture labels

* Refine detector lab fixtures

* Fix stale detector overlay references

* Fix detector lab fixture URLs

* Fix typography lab fixture highlights

* Fix typography lab page-level signal

* Fix visual overlay lifecycle cleanup

* Remove dead spotlight timer cleanup

* Make browser async APIs reject consistently

site/data/anti-patterns-catalog.js

@@ -1,8 +1,8 @@
 /**
  * Manual metadata for the /anti-patterns page.
  *
- * The detection rules themselves live in cli/engine/detect-antipatterns.mjs and
- * are parsed at build time. This file adds three pieces of content that
+ * The detection rules themselves live in cli/engine/registry/antipatterns.mjs.
+ * This file adds three pieces of content that
  * can't be automated:
  *
  *  1. DETECTION_LAYERS: which layer (cli, browser, or llm) catches the