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## Why Extensions need a stable place to observe token accounting after Codex folds model-provider usage into the session's cached `TokenUsageInfo`. Without a contributor hook, extension-owned features that need last-turn or cumulative token usage have to duplicate session plumbing or infer state from client-facing `TokenCount` notifications. ## What changed - Added `TokenUsageContributor` to `codex-extension-api`, passing session/thread `ExtensionData`, `ThreadId`, turn id, and the current `TokenUsageInfo`. - Added registry builder/storage support for token-usage contributors. - Invoked registered contributors from `Session::record_token_usage_info` after the session token cache is updated and before the client `TokenCount` notification is emitted. ## Testing - Added `record_token_usage_info_notifies_extension_contributors`, covering cumulative token usage updates and access to both extension stores.