Owen Lin 40db507eec
Avoid redundant settings checkpoints when resuming threads ( #56250 ) ...
## Why
Resuming a thread with unchanged settings appended another `ThreadSettingsApplied` event to its rollout.
## What changed
Compare the effective settings with the latest persisted settings for the same thread before writing a checkpoint. Persist settings when they differ or no matching checkpoint exists, even if no turn follows the resume.
## Testing
Add a regression test that restarts the app server, resumes a materialized thread without overrides, and verifies that its persisted settings events remain unchanged.
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Owen Lin
40db507eec