* fix(ci): classify unresolved workflow failures
Replaces rolling historical failure escalation with active consecutive streaks and verifies Sentry zero/unavailable states.\n\nPlan: https://github.com/dzianisv/opencode-mobile/issues/139#issuecomment-5044502048
* fix(ci): scope failure streaks to default branch
Prevents pull-request failures from becoming production health signals for issue #139.
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Co-authored-by: engineer <engineer@gray-knight-m1.local>
