feat(bot): implement issue-fixer skill and mandate selection

[gundermanc]

Summary

This PR implements the issue-fixer skill for the Gemini CLI Bot and adds the ability to manually select the bot's mandate (auto, issue-fixer, metrics, interactive) when triggering the workflow via workflow_dispatch. It also updates the CI policy to allow the activate_skill tool.

Details

• Issue Fixer Skill: Created a new issue-fixer skill that enables the bot to proactively identify and fix effort/small issues and maintain existing bot-fix PRs.
• Mandate Selection: Updated the gemini-cli-bot-brain.yml workflow to include a mandate choice input. This allows maintainers to explicitly test specific bot behaviors.
• Workflow Logic: Refined the shell logic in the workflow to correctly synchronize PROMPT_FILE and MANDATE based on the input override and improved logging for better visibility in Action logs.
• Policy Update: Added activate_skill to the ci-policy.toml to ensure the bot can utilize its specialized skills in the CI environment.
• Incremental Refactor Alignment: Successfully rebased and integrated these changes with the recent skills-based refactoring in main.

Related Issues

Related to #26717

How to Validate

1. Manual Trigger: Go to the Actions tab and run the 🧠 Gemini CLI Bot: Brain workflow on this branch.
2. Verify Mandate: Select issue-fixer or interactive from the mandate dropdown and verify in the logs that the correct prompt and mandate are selected.
3. Policy Check: Verify that the activate_skill tool call succeeds (or no longer fails with "Tool not found").

Pre-Merge Checklist

• Updated relevant documentation and README (if needed)
• Added/updated tests (if needed)
• Noted breaking changes (if any)
• Validated on required platforms/methods:
  • MacOS
    • npm run

[github-actions]

Size Change: -4 B (0%)

Total Size: 34.1 MB

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