dermanyang-oai b781733f95 Separate thread preparation from execution persistence (#47199) ...

## Why

Injecting context before the first turn currently forces a full flush. Stores need a preparation checkpoint that can leave disposable context in memory, while local storage must keep prepared context durable before the first user input.

## What changed

- Add `PersistContext::ThreadPreparation` and `CodexThread::checkpoint_preparation()`, and use the checkpoint in `inject_response_items()`.
- Allow stores to defer rollout-derived metadata writes through `record_thread_metadata()`, including during preparation and execution checkpoints. Keep standard metadata updates synchronous.
- Flush local storage at preparation checkpoints so injected context survives restart.

## Testing

Add tests showing that preparation and first sampling can proceed without waiting for durable metadata. Cover prepared context in first and follow-up requests, plus durability before first input and restoration after restart, in both legacy and paginated history modes.

GitOrigin-RevId: 74f6bb1a5f8d47192364b8bba6afd703a3b7d688

2026-09-22 05:53:29 +00:00

..

local

Separate thread preparation from execution persistence (#47199)

2026-09-22 05:53:29 +00:00

error.rs

feat(app-server): add history_mode to thread (#29927)

2026-06-26 09:12:42 -07:00

in_memory.rs

Persist thread creator identity in rollouts and SQLite (#47113)

2026-09-21 21:22:01 +00:00

lib.rs

Add thread attachment operations with coordinated deletion (#44350)

2026-09-10 00:30:27 +00:00

live_thread.rs

Separate thread preparation from execution persistence (#47199)

2026-09-22 05:53:29 +00:00

projects.rs

Add recency sorting to project/list (#41223)

2026-08-27 23:43:46 +00:00

queue_store.rs

Dispatch queued messages written by other processes (#39034)

2026-08-17 17:19:46 +00:00

store.rs

Separate thread preparation from execution persistence (#47199)

2026-09-22 05:53:29 +00:00

thread_attachments.rs

Add thread attachment operations with coordinated deletion (#44350)

2026-09-10 00:30:27 +00:00

thread_metadata_sync.rs

Persist thread creator identity in rollouts and SQLite (#47113)

2026-09-21 21:22:01 +00:00

thread_sections.rs

Add appearance metadata to thread sections (#37898)

2026-08-10 23:32:42 +00:00

types.rs

Preserve and expose thread item lifecycle timestamps (#47114)

2026-09-21 22:23:26 +00:00