chore: auto-close issues when PRs merge to dev

[sasagar]

Closes #160

Summary

Add close-issues.yml workflow that triggers when PRs are merged to dev.
Parses Closes #N / Fixes #N / Resolves #N from PR bodies and
auto-closes the referenced issues with a comment.

How it works

• Triggers on pull_request.closed event for dev branch
• Only runs if the PR was actually merged (not just closed)
• Uses actions/github-script to parse and close issues via GitHub API

Test plan

• This PR itself will test the workflow — issue chore: auto-close issues on PR merge to dev #160 should auto-close on merge

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 6b2f4a90-3359-4534-a500-29403e90ea85

📥 Commits

Reviewing files that changed from the base of the PR and between 9356a8f and f91aad8.

📒 Files selected for processing (1)

• .github/workflows/close-issues.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/issue-160-auto-close-issues

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