Add actionlint workflow and fix requirements traceability validator

[2-Coatl]

Summary

• add an actionlint workflow to validate GitHub Actions syntax on pushes, pull requests, and manual runs
• rewrite the requirements traceability validator to use PyYAML and handle invalid front matter safely
• update the workflows review document with findings and recommendations

Testing

• not run (not requested)

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Codex Task

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Install PyYAML after selecting runner Python

The workflow installs PyYAML before running actions/setup-python, so the package is placed in the runner’s default Python (currently 3.10) but the validation script later runs with the 3.11 interpreter configured by the setup step. On ubuntu-latest this causes the import yaml at runtime to fail with ModuleNotFoundError, preventing the traceability check from running on any branch. Move the pip install after the setup-python step (or use python -m pip from the configured interpreter) so the dependency is available to the Python version executing the script.

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[Copilot]

Pull Request Overview

This PR adds GitHub Actions workflow validation and improves requirements traceability validation by:

• Adding an actionlint workflow to validate GitHub Actions syntax automatically
• Rewriting the requirements traceability validator to use PyYAML for robust YAML parsing
• Documenting workflow review findings and optimization recommendations

Key Changes

• New actionlint workflow enables syntax validation on workflow changes via push, pull requests, and manual dispatch
• Requirements validator now uses PyYAML instead of manual parsing, adds error handling for invalid front matter, and reports parsing failures
• Documentation added summarizing all workflows with highlighted findings about validation improvements

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
.github/workflows/actionlint.yml	New workflow to validate GitHub Actions syntax using actionlint v1.7.1
.github/workflows/requirements_validate_traceability.yml	Replaced manual YAML parsing with PyYAML, added invalid front matter tracking, improved error handling and code formatting
.github/workflows/REVIEW.md	New documentation summarizing all workflows with triggers, jobs, and key findings about validation improvements

[Copilot]

Dependencies are installed before Python is set up. The 'Install validation dependencies' step should be moved after 'Setup Python' to ensure pip uses the correct Python version and environment. The current order may use the system Python instead of the configured 3.11 version.

[Copilot]

The type hint Iterable | str | None is too broad. Since str is itself an Iterable, this may cause unexpected behavior if a string is processed as an iterable of characters rather than as a single string value. Consider using Iterable[Any] | str | None or reordering to str | Iterable | None with explicit type checks to ensure strings are handled correctly before other iterables.

Suggested change

	from typing import Iterable, List
	import yaml
	FRONT_MATTER_PATTERN = re.compile(r"^---\s*\n(.*?)\n---\s*", re.DOTALL)
	def ensure_list(value: Iterable | str | None) -> List[str]:
	from typing import Iterable, List, Any
	import yaml
	FRONT_MATTER_PATTERN = re.compile(r"^---\s*\n(.*?)\n---\s*", re.DOTALL)
	def ensure_list(value: str | Iterable[Any] | None) -> List[str]: