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## Why Thread unload timing used the server-wide delay, ignoring per-thread configuration overrides. Clients need to control how long individual idle, unsubscribed threads remain loaded. ## What changed - Resolve unload timing from each loaded thread's `thread_unload_delay_secs` configuration. Setting it to `0` allows immediate unloading once the thread has no subscribers or activity. - Allow this runtime retention override in `experimentalPredictionMode` forks while continuing to reject other configuration overrides. Reject negative values and delays too large to schedule. - Replace the source-specific immediate-unload behavior with explicit configuration. ## Testing Extend integration coverage for per-thread delays, unloading after active turns finish, fork overrides, and invalid prediction-fork delays. Verify that immediate unloading preserves persistent history and that cold resumes and ordinary nested forks use their default delay instead of retaining the previous runtime's override. GitOrigin-RevId: fcb82bd73a101260c51e2a8476f94320c23ac929