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Remove ghost snapshots (#19481)

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## Summary
- Remove `ghost_snapshot` / `GhostCommit` from the Responses API surface
and generated SDK/schema artifacts.
- Keep legacy config loading compatible, but make undo a no-op that
reports the feature is unavailable.
- Clean up core history, compaction, telemetry, rollout, and tests to
stop carrying ghost snapshot items.

## Testing
- Unit tests passed for `codex-protocol`, `codex-core` targeted undo and
compaction flows, `codex-rollout`, and `codex-app-server-protocol`.
- Regenerated config and app-server schemas plus Python SDK artifacts
and verified they match the checked-in outputs.
This commit is contained in:
pakrym-oai
2026-04-27 18:48:57 -07:00
committed by GitHub
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parent 7e8594fc19
commit 4e05f3053c
43 changed files with 305 additions and 3254 deletions
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codex-rs/protocol/src/protocol.rs
+4 -1
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@@ -775,7 +775,10 @@ pub enum Op {
/// model.
SetThreadMemoryMode { mode: ThreadMemoryMode },
/// Request Codex to undo a turn (turn are stacked so it is the same effect as CMD + Z).
/// Legacy request to undo a turn.
///
/// The op is still accepted for compatibility, but ghost snapshots are no
/// longer produced so the request reports unavailable.
Undo,
/// Request Codex to drop the last N user turns from in-memory context.