fix: enable delete_branch_on_merge in settings.yml for compliance

[don-petry]

Summary

• Adds delete_branch_on_merge: true under the repository: section of .github/settings.yml
• When probot/settings runs, it will declaratively enforce automatic head-branch deletion after every PR merge
• Resolves the weekly compliance audit finding that has been open since this issue was filed

Background

Previous PRs #184 and #200 implemented the same fix but were not merged. This PR supersedes both. The GitHub API already returns delete_branch_on_merge: true (set manually), but without it in the declarative config, probot/settings could silently reset it on any future run.

Changes

• .github/settings.yml: Added repository.delete_branch_on_merge: true

Closes #164

Generated with Claude Code

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• .github/settings.yml

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[don-petry]

@don-petry — This PR is ready for review and merge.

What this does: Adds delete_branch_on_merge: true to .github/settings.yml so probot/settings declaratively enforces automatic head-branch deletion. This permanently resolves the compliance finding in #164.

Note: This supersedes the two earlier open PRs (#184 and #200) that made the identical change but were not merged. Once this PR is merged, you may close those as duplicates.

This is a config-only YAML change with no code impact — CI should pass cleanly.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[Copilot]

Pull request overview

Adds a declarative repository setting to ensure Probot Settings enforces automatic deletion of head branches after PR merges, addressing the compliance finding in #164.

Changes:

• Added a top-level repository: section to .github/settings.yml
• Set repository.delete_branch_on_merge: true with an inline standards reference