fix: correct Codex plan type detection from JWT auth

[Shironex]

Summary

• Fix hardcoded planType: 'plus' that was incorrectly returned as default when CLI test succeeded
• Read plan type from correct JWT path: claims['https://api.openai.com/auth'].chatgpt_plan_type
• Add subscription expiry check - automatically override to 'free' if subscription has expired
• Use getCodexAuthPath() from @automaker/platform instead of manual path construction
• Remove unused imports (os, fs, path) and unused class properties
• Clean up code and add minimal essential logging (only errors and important events)

Test plan

• Verify Codex usage shows correct plan type (free/plus/pro) based on JWT
• Verify expired subscriptions show as "free" plan
• Verify rate limit detection still works and shows correct plan from error response

🤖 Generated with Claude Code

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[gemini-code-assist]

Summary of Changes

Hello @Shironex, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request refines the Codex usage service to accurately determine a user's plan type and subscription status. It addresses issues with hardcoded plan values, introduces a mechanism to detect and handle expired subscriptions, and improves the overall reliability of plan detection by prioritizing information from the authentication JWT. Additionally, it includes significant code cleanup and logging enhancements for better maintainability.

Highlights

• Accurate Plan Type Detection: The logic for determining the Codex plan type has been significantly improved, moving away from a hardcoded 'plus' value. It now correctly reads the 'chatgpt_plan_type' from the JWT claims within the authentication token.
• Subscription Expiry Handling: A new check has been implemented to detect expired subscriptions. If a subscription is found to be expired, the plan type is automatically overridden to 'free', ensuring accurate representation of user access.
• Refactored Authentication Path: The method for locating the Codex authentication file has been standardized by utilizing 'getCodexAuthPath()' from the '@automaker/platform' library, improving consistency and maintainability.
• Code Cleanup and Logging: Unused imports ('os', 'fs', 'path') and class properties have been removed. Logging has been streamlined to focus on errors and important events, enhancing code clarity and debugging.
• Robust JWT Parsing: The JWT parsing logic has been made more robust, including checks for malformed tokens and adapting to Node.js environments by using 'Buffer' for base64 decoding.

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[gemini-code-assist]

Code Review

This pull request is a great improvement. It correctly fixes the hardcoded planType and introduces a more robust way of detecting the plan from the JWT in the auth file, including checking for subscription expiry. The code cleanup, such as removing unused imports and properties and switching to a structured logger, is also very welcome.

I've added a few suggestions to further improve the robustness of the new JWT parsing logic by adding more type checks, and to refactor a function to reduce code duplication, which will make the code easier to maintain in the future.