feat(browser): Add `bfcacheMetricsIntegration` - #22397

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logaretm wants to merge 10 commits into

awad/bfcache-integration

Commits on Aug 4, 2026

feat(browser): Add bfcacheMetricsIntegration
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test(browser): Add real bfcache e2e app, drop simulated suite
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test(browser): Assert masked-frame notRestoredReason in bfcache e2e
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test(browser): Cover the IndexedDB versionchange bfcache blocker
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test(browser): Cover the no-store + cookie-change bfcache miss
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refactor(browser): Drop redundant bfcache navigation_type attribute
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test(browser): Cover bfcache iframe eligibility and child-frame reasons
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refactor(browser): Make bfcache frame purely positional
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refactor(browser): Drop conditional spreads for bfcache metric attributes
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fix(browser): Report all bfcache reasons by default
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