This PR adds a new reflex action to the Gemini CLI Bot that automatically provides high-level pre-reviews for new pull requests.
### Changes:
- Created `tools/gemini-cli-bot/reflexes/scripts/pr_pre_review.ts`: A reflex script that uses Gemini to evaluate PRs based on quality, roadmap alignment, "obvious wins," and repository best practices.
- Updated `.github/workflows/gemini-cli-bot-pulse.yml`: Added `GEMINI_API_KEY` and ensure the Gemini CLI is bundled before running reflex actions.
### Impact:
- **Time to First Response**: Will decrease as the bot provides initial feedback within 30 minutes of PR submission.
- **Maintainer Productivity**: High-level assessments and roadmap alignment checks will help maintainers prioritize reviews.
- **Contributor Experience**: Immediate feedback on best practices and roadmap alignment.
This addresses the request in issue #26471.
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