Summary

Resolve tool and configuration parity gaps between .devcontainer/ and .github/workflows/copilot-setup-steps.yml to ensure consistent behavior across local development and Codespaces prebuild environments.

Acceptance Criteria

• All tools installed in copilot-setup-steps.yml are also available in the devcontainer (and vice versa)
• Version specifications match between both environments where applicable
• PowerShell modules reach version parity between both targets
• Python version aligned across both environments
• Any tool present in one environment but missing from the other is either added or explicitly documented as environment-specific with justification

Known Parity Gaps

References

• Related PRs: docs: Document Copilot Cloud Coding Agent ↔ DevContainer Tool Parity and Setup Workflow #389, bug: npm run lint:frontmatter fails — powershell-yaml module not installed in devcontainer #499, bug: npm run lint:yaml fails — actionlint not installed in devcontainer #498, bug: npm run lint:ps fails when logs/ directory does not exist #497
• Script sources: .devcontainer/scripts/on-create.sh, .devcontainer/scripts/post-create.sh