feat: account active goal progress in the goal extension

[jif-oai]

Why

The goal extension can create and surface goals, but the live turn-accounting path still stopped short of persisting active-goal progress. That leaves token and wall-clock usage, plus ThreadGoalUpdated events, out of sync with the extension boundary once work actually advances or a goal transitions out of active state.

What changed

• Teach GoalAccountingState to track the current turn, active goal, token deltas, and wall-clock progress snapshots against the persisted goal id.
• Flush active-goal accounting from tool-finish, turn-stop, and turn-abort lifecycle hooks, and emit ThreadGoalUpdated events when persisted progress changes.
• Route create_goal and update_goal through the same accounting state so new goals start from the right baseline, final progress is flushed before status changes, and update_goal can mark a goal blocked as well as complete.
• Keep budget-limited goals accruing through the end of the turn while clearing local active-goal state once a turn or explicit update is finished.
• Expand backend and lifecycle coverage around store ids, baseline reset, tool-finish accounting, budget-limited carry-through, and blocked-goal updates.

Testing

• Added focused backend coverage in codex-rs/ext/goal/tests/goal_extension_backend.rs for baseline reset, tool-finish accounting, budget-limited turns, and blocked-goal updates.
• Extended codex-rs/core/src/session/tests.rs to assert that lifecycle inputs expose the expected session, thread, and turn store ids.

[jif-oai]

@codex review

[chatgpt-codex-connector]

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