feat(caretaker): add triage worker core foundation (part 1/2)

[chadd28]

Summary

This Pull Request introduces the core foundational modules for the Caretaker Agent Triage Worker (tools/caretaker-agent/cloudrun/triage-worker/). To keep code review focused and modular, the Triage Worker implementation is split into two Pull Requests:

• Part 1 (This PR): Establishes the Firestore concurrency ledger, output validation schemas, AI reasoning prompts/skills, and automated CI test infrastructure.
• Part 2 (Follow-up PR): Connects the Cloud Run Job execution orchestrator, logging helpers, and Docker container configuration.

Details

• Firestore Concurrency Ledger & CI Workflow: Implements db/issues_store.py providing transactional lock claim/release routines, 15-minute lock expiration timers, and 2-strike escalation rules. Adds .github/workflows/tools-python-ci.yml for automated Python CI testing.
• Output Schema Validator: Implements utils/validator.py enforcing strict JSON structure and metadata validation for LLM triage outputs, along with unit tests.
• AI Reasoning Prompts & Skills: Adds system orchestration instructions (.gemini/triage_orchestrator.md) and dedicated skills (quality, effort, spec_generator) under .gemini/skills/.

How to Validate

Reviewers can validate this PR by running the automated Python unit test suite:

1. Verify via GitHub Actions: Check the automated Testing: Tools (Python) status check.
2. Run Unit Tests Locally:

cd tools/caretaker-agent/cloudrun/triage-worker
python3 -m unittest discover

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
    • npx
    • Docker
    • Podman
    • Seatbelt
  • Windows
    • npm run
    • npx
    • Docker
  • Linux
    • [] npm run
    • [] npx
    • Docker

[github-actions]

📊 PR Size: size/L

• Lines changed: 766
• Additions: +766
• Deletions: -0
• Files changed: 15

[gemini-code-assist]

Summary of Changes

Hello, 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 establishes the core foundational architecture for the Caretaker Agent Triage Worker. It focuses on implementing reliable state management via Firestore and enforcing strict validation for AI-driven triage outputs. By introducing transactional locking and modular AI reasoning skills, this change provides the necessary infrastructure to support automated issue triage workflows.

Highlights

• Firestore Concurrency Ledger: Implemented db/issues_store.py to provide transactional lock claim and release routines, ensuring safe concurrent processing of GitHub issues.
• Output Validation: Added utils/validator.py to enforce strict JSON schema compliance for AI-generated triage outputs, including comprehensive unit tests.
• AI Reasoning Skills: Introduced system orchestration instructions and specialized skills (quality, effort, spec_generator) to guide the Triage Worker's reasoning process.
• Testing Infrastructure: Established a robust unit testing suite for the Firestore store and validator modules to ensure reliability in the CI pipeline.

Ignored Files

• Ignored by pattern: .github/workflows/** (1)
  • .github/workflows/tools-python-ci.yml

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[gemini-code-assist]

Code Review

This pull request introduces a Python-based triage worker for managing and validating GitHub issue triage workflows, including Firestore-backed state locking, LLM output validation, and associated unit tests. The code review highlights several critical security and architectural issues that must be addressed: a potential dependency confusion vulnerability in requirements.txt due to the unverified google-antigravity package, a path traversal vulnerability in utils/validator.py caused by a lack of path validation on untrusted LLM outputs, module-level Firestore client initialization that hinders clean unit testing, and potential AttributeError crashes when handling null lock fields in Firestore.

[chadd28]

@gundermanc @adamfweidman ready for your review whenever you have a chance! To try and keep the PR easy to review, I split the worker into two parts. If you'd prefer me to append the rest of the main orchestrator loop into this same PR instead of doing a Part 2, let me know. Thanks!