fix: SendGrid webhook batching, idempotency-key stability, TTS circuit breaker, and cross-tenant job isolation - #1246

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Mystery-CLI wants to merge 4 commits into

solutions-plug:mainfrom

Mystery-CLI:fix/audit-findings-batch-1

Commits on Jul 28, 2026

perf(email): process SendGrid webhook batches concurrently
Mystery-CLI
committed
6f8df49
fix(email): derive idempotency key from job creation time, not wall-clock hour bucket
Mystery-CLI
committed
907e74e
fix(tts): fire circuit breaker once per request instead of once per retry attempt
Mystery-CLI
committed
7d1878a
fix(tts): scope job lookup/listing to the requesting credential's tenant
Mystery-CLI
committed
76708e6