test(opencode): add pending-snapshot evidence driver for #19228

Replays recorded OpenCode 2 fixtures through OrchestratorV2 and records
the adapter's provider_thread.updated snapshots per native thread, since
pendingBackgroundWork does not reach domain events at this head.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
9b97de29a6Julius Marminge committed on 10/22/2026, 11:37:52 AMparent4cc7441

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