fix: add repository block to settings.yml for allow_auto_merge

[don-petry]

Summary

• Adds repository block to .github/settings.yml with allow_auto_merge: true so the setting is declaratively managed via probot/settings
• Also adds delete_branch_on_merge: true and has_wiki: false to match the full standard defaults
• Re-applied the setting via GitHub API for immediate effect

Root Cause

The compliance audit has been finding allow_auto_merge: null periodically. While the API-level setting gets patched to true, without it being declared in .github/settings.yml, probot/settings can reset it on subsequent runs. This PR makes the setting authoritative and prevents future drift.

Note: PR #185 contains the identical fix but has not been merged. This supersedes it.

Closes #163

Generated with Claude Code

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Reviewing files that changed from the base of the PR and between 32e618b and 6b38a26.

📒 Files selected for processing (1)

• .github/settings.yml

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• Create PR with unit tests
• Commit unit tests in branch claude/issue-163-20260419-2233

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[don-petry]

Self-review complete - change adds the repository block to .github/settings.yml with allow_auto_merge: true, delete_branch_on_merge: true, and has_wiki: false. Format is correct for probot/settings. CI is passing. Note: PR 185 contains the identical fix but has been waiting for merge since 2026-04-14, this PR supersedes it. @don-petry as CODEOWNER, please review and merge to resolve the recurring compliance audit finding.

[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

This PR makes allow_auto_merge (and related standard repository settings) declaratively managed via probot/settings by adding a repository block to .github/settings.yml, preventing the setting from drifting back to null on subsequent runs.

Changes:

• Added a repository section to .github/settings.yml with allow_auto_merge: true
• Also set delete_branch_on_merge: true and has_wiki: false to match the referenced standard defaults