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pakrym-oai
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## Why Compaction now installs replacement history inside the session, but the turn and compaction callers were still reaching into `ModelClientSession` to reset websocket transport state after that install. That made a transport-level reset part of the compaction API even though websocket incremental request selection already checks whether the next request is a strict extension of the previous one and falls back to a full `response.create` when it is not. ## What changed - Removed the compaction-side calls to `reset_websocket_session` from `compact.rs` and `session/turn.rs`. - Simplified pre-sampling and mid-turn compaction helpers so they return `CodexResult<()>` instead of carrying a reset flag. - Made `ModelClientSession::reset_websocket_session` private to `client.rs`, leaving only the websocket timeout recovery path inside the client as a caller. ## Validation - `cargo test -p codex-core --test all responses_websocket_creates_on_non_prefix` - `cargo test -p codex-core --test all steered_user_input_waits_for_model_continuation_after_mid_turn_compact` - `cargo test -p codex-core --test all pre_sampling_compact_runs_on_switch_to_smaller_context_model`