* feat(browser): add all-tabs extension access * fix(browser): preserve cancel revocation during startup * test(browser): align all-tabs Chromium fixtures
* feat(browser): add relay authentication v2 * fix(browser): cap relay test WebSocket payload * fix(browser): keep relay E2E inside extension boundary * fix(browser): isolate relay admission and cleanup auth * fix(browser): finish relay auth migration hardening * fix(browser): keep preauth transport bounded through teardown