Add CI build matrix with Node 20, 22, and 24

[himerus]

Summary

Summary

Replicate the CI Matrix parity pattern from HELiX (reference implementation at /Volumes/Development/booked/helix) to helixir. This ensures helixir tests pass across Node 20, 22, and 24 — matching GitHub CI and catching forward-compatibility issues locally.

Reference Files (helix template)

• /Volumes/Development/booked/helix/.github/workflows/ci-matrix.yml — GitHub CI Matrix workflow
• /Volumes/Development/booked/helix/.github/workflows/act-ci.yml — Local CI with `test-full...

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Recovered automatically by Automaker post-agent hook

Summary by CodeRabbit

• Chores
  • Added comprehensive CI/testing pipelines for improved code quality assurance
  • Extended Node.js version support to include versions 20, 22, and 24

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

Plan: Pro

Run ID: 18c95662-8da4-4fca-94bd-f18028bd5696

📥 Commits

Reviewing files that changed from the base of the PR and between 4cf81ea and 129d7ec.

📒 Files selected for processing (3)

• .automaker/context/agent-push-protocol.md
• scripts/act-ci.sh
• scripts/preflight.sh

Walkthrough

Three configuration files were added or modified to expand CI/CD infrastructure. Two new GitHub Actions workflows—act-ci.yml for local CI execution with quality gates and matrix testing, and ci-matrix.yml for remote matrix-based CI across multiple Node.js versions—were introduced. Additionally, Node.js engine requirements in package.json were broadened to support versions 20, 22, and 24.

Changes

Cohort / File(s)	Summary
GitHub Actions Workflows .github/workflows/act-ci.yml, .github/workflows/ci-matrix.yml	Added two new CI workflows: act-ci.yml defines quality-gates and conditional test-full jobs with pnpm dependency management and a Vitest hang watchdog; ci-matrix.yml runs matrix tests across Node versions 20, 22, 24 with conditional skip logic for staging-to-main promotion PRs.
Package Configuration package.json	Updated engines.node from >=20.0.0 to `^20.0.0

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~25 minutes

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The PR description is incomplete, missing required sections like Type of change, Tests added, and Checklist verification items.	Complete the PR description by filling in all required template sections including type of change, whether tests were added, and checklist items.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately summarizes the main change: adding CI build matrix support for Node 20, 22, and 24.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feature/ci-node-matrix-20-22-24

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