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Two CDP-session lifecycle helpers in cdp-bridge.ts:
- withCdpSession(page, fn): ephemeral session with try/finally detach.
For one-shot CDP work (archive snapshots, $B memory, single
Page.captureScreenshot) where the caller doesn't need session reuse.
- getOrCreateCdpSession(page, cache): cached long-lived session that
registers a page.once('close') hook to BOTH delete the cache entry
AND call session.detach(). Pre-helper code only deleted the cache
entry, leaving the Chromium-side CDP target attached until the
underlying transport dropped.
Pure addition. Existing callers untouched in this commit; they migrate
in the next commit alongside the static-grep test that pins the
invariant.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>