Playwright (and recent Puppeteer) call Target.attachToBrowserTarget on
connect to obtain a session for the implicit "browser" target. Without
the handler the dispatcher returns "Unknown Target method:
attachToBrowserTarget" and the connect handshake aborts before any
user code runs.
Add a handler that mirrors Target.attachToTarget but for the browser
target: register a "browser-session" → "browser" mapping in
ctx.sessions, emit Target.attachedToTarget with type=browser, and
return the new session id.
Note: this addresses item (1) from #64. The Rocket Loader / Cloudflare
JS execution gap and Page.getLayoutMetrics are tracked separately
(getLayoutMetrics is fixed in PR #79).
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