Run the e2e suite on web in CI, and add AGENTS.md

[tvanlaerhoven]

Summary

The e2e app can now boot into the cavynext test runner on web, and pr_web.yml runs that suite
(E2E_HEADLESS=true npm run test:e2e:web) next to the existing build + docs check. All 8 connector
specs pass locally in headless Chrome (8 examples, 0 failures).

Four things were blocking a web run, all in apps/e2e:

• Entry naming. cavynext only accepts entry files ending in .js and swaps index.web.js for
  index.test.web.js while it runs, so index.web.tsx was split into .js wrappers plus
  web/app.web.tsx (normal app) and web/test.web.tsx (test app, deliberately not in
  <StrictMode>).

• Worker version mismatch. webpack copied the THEOplayer worker/iframe assets from the workspace
  root while bundling the player hoisted into apps/e2e, which fails at runtime with "THEOplayer
  workers could not be loaded". Both now come from the same package:

  const theoplayerDirectory = path.dirname(require.resolve('theoplayer/package.json', { paths: [appDirectory] }));

  iframe.html was missing from the copy patterns altogether (404 on theoplayer/iframe.html).

• Autoplay. the test player gets a web config (libraryLocation: 'theoplayer',
  mutedAutoplay: 'all'), without which the suite hangs after play and never reaches playing.

• Headless browser. E2E_HEADLESS=true makes the dev server open Chrome headless with a
  dedicated --user-data-dir; joining an already running browser makes cavynext see "an extra app
  connection" and hang. .env is now optional, since CI has none.

AGENTS.md is the repository guidance file coding agents read automatically. It records what needed
rediscovering: per-package npm test / npm run typescript vs the root npm test being a typedoc
docs check, what each CI workflow really verifies, the known-red root prettier files under
comscore/, drm/ and engage/ that must not be reformatted, changeset and peerDependency rules,
and the web e2e pitfalls above.

Verified: root npm run build, npm test, npm run lint (0 errors) and the headless web e2e run.

Link to Devin session: https://dolby.devinenterprise.com/sessions/3a7ef07a2c3e45b9801dc0296f2d3ea4
Requested by: @tvanlaerhoven

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Devin Review found 1 potential issue.