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## Why The goal extension needs more context when a turn starts than `turn_store` alone provides. In particular, goal accounting needs the stable turn id, the effective collaboration mode, and the cumulative token-usage baseline captured at turn start so it can: - suppress goal accounting for plan-mode turns - compute exact per-turn deltas from cumulative `total_token_usage` snapshots instead of relying on the most recent usage event alone - keep the extension-owned accounting path aligned with the host turn lifecycle ## What - extend `codex_extension_api::TurnStartInput` to expose `turn_id`, `collaboration_mode`, and `token_usage_at_turn_start` - pass the full `TurnContext` plus the captured token-usage baseline through the turn-start lifecycle emission path - initialize goal turn accounting from the turn-start baseline and collaboration mode - switch goal token accounting to compute deltas from cumulative `total_token_usage` snapshots - add coverage for the new turn-start lifecycle fields and for goal-accounting baseline behavior ## Testing - added `turn_start_lifecycle_exposes_turn_metadata_and_token_baseline` in `codex-rs/core/src/session/tests.rs` - added `ext/goal/tests/accounting.rs` coverage for baseline-aware goal accounting and plan-mode suppression