feat: CEF mode for Electrobun E2E — CDP automation, WebGL unlocked
- electrobun.config.ts: AGOR_CEF=1 enables bundleCEF + chromiumFlags
(remote-debugging-port=9222). Production stays on WebKitGTK.
- wdio.electrobun.conf.js: rewritten for CDP via devtools protocol.
Spawns app, waits for CDP port, kills on complete.
- helpers/actions.ts: waitForPort() polls CDP /json endpoint
- docs/testing.md: CEF mode docs, CI setup, troubleshooting
- npm script: test:e2e:electrobun prepends AGOR_CEF=1
CEF also enables: WebGL xterm.js addon (unlimited terminals),
WebGPU, full Chrome DevTools — all for dev/test only.
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