[codex] Fix atomic sync gates#1020
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Fixes thundering-herd syncs caused by unsynchronized check-then-act gates in the poll and interval synchronizers. The poll adapter now coordinates in-flight local updates, retries after failed synchronization, and resets sync state after forks; the interval synchronizer now claims each elapsed interval atomically. This keeps concurrent request threads from issuing duplicate remote reads and overlapping local writes for the same sync window. Validated with
bundle exec rspec spec/flipper/adapters/poll_spec.rb spec/flipper/adapters/sync/interval_synchronizer_spec.rbandbundle exec rspec spec/flipper/adapters, which passed with the existing 2 sqlite pending examples.