ci: add dependency-audit.yml workflow

[don-petry]

Summary

• Adds .github/workflows/dependency-audit.yml by copying the org-standard template verbatim from petry-projects/.github/standards/workflows/dependency-audit.yml
• Thin caller stub that delegates all audit logic to the reusable workflow at petry-projects/.github/.github/workflows/dependency-audit-reusable.yml@v1
• Runs on PRs and pushes to main

Closes #49

Generated with Claude Code

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⚙️ Run configuration

Configuration used: Organization UI

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Run ID: ee833767-4059-4365-ae69-4d92e106b24f

📥 Commits

Reviewing files that changed from the base of the PR and between 5042df9 and 08da6f8.

📒 Files selected for processing (1)

• .github/workflows/dependency-audit.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch claude/issue-49-20260508-1409

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[Copilot]

Pull request overview

Adds the missing org-standard dependency vulnerability audit workflow to bring the repository into CI compliance (per Issue #49) by introducing a thin caller stub that delegates to the centralized reusable workflow.

Changes:

• Add .github/workflows/dependency-audit.yml thin-caller workflow.
• Configure it to run on pull_request and push targeting main.
• Delegate all audit logic to petry-projects/.github/.github/workflows/dependency-audit-reusable.yml@v1.

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[don-petry]

Self-review: The workflow is a verbatim copy of the org standard template.

CI: CodeQL and pip-audit pass. The npm audit job fails as expected — it correctly detected the 21 pre-existing npm vulnerabilities already flagged on the default branch (5 high, 15 moderate, 1 low). Addressing those is a separate task.

@don-petry — please review and merge when ready.