chore(consensus): Finalize step improvements and fixes#1488

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ancazamfir wants to merge 2 commits intocirclefin:mainfrom

ancazamfir:finalize-fixes

Commits on Feb 17, 2026

Always respect target_time regardless of sync decision, unify finalization via timeout path
ancazamfir
committed

Commits on Feb 18, 2026

Send valid extended certificate in Finalize, add test
ancazamfir
committed