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## Summary This PR makes `thread/resume` reuse persisted thread model metadata when the caller does not explicitly override it. Changes: - read persisted thread metadata from SQLite during `thread/resume` - reuse persisted `model` and `model_reasoning_effort` as resume-time defaults - fetch persisted metadata once and reuse it later in the resume response path - keep thread summary loading on the existing rollout path, while reusing persisted metadata when available - document the resume fallback behavior in the app-server README ## Why Before this change, resuming a thread without explicit overrides derived `model` and `model_reasoning_effort` from current config, which could drift from the thread’s last persisted values. That meant a resumed thread could report and run with different model settings than the ones it previously used. ## Behavior Precedence on `thread/resume` is now: 1. explicit resume overrides 2. persisted SQLite metadata for the thread 3. normal config resolution for the resumed cwd
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