This PR implements the "Triage Accuracy (Overrides)" metric as requested in #26660 (Option 1).
## Changes
- Created `tools/gemini-cli-bot/metrics/scripts/triage_accuracy.ts`.
- The script uses GraphQL to analyze the last 100 issues.
- It detects the first `area/*` label added by a bot (`gemini-cli-robot` or any `*[bot]`).
- It flags an "override" if a human later removes that label or replaces it with a different `area/*` label.
## Expected Impact
This metric provides a feedback loop for our automated triage system, allowing us to measure how often maintainers need to correct the bot's classification. This will help in fine-tuning the triage prompts and logic.
## Metrics Added
- `triage_accuracy_overrides`: Total number of human overrides in the sample.
- `triage_accuracy_total_bot_labeled`: Total number of issues labeled by the bot in the sample.
- `triage_accuracy_rate`: The ratio of correct (non-overridden) triage actions.
gemini-cli[bot]