Add auto-cleanup for merged feature branches

[ChaseDRedmon]

Summary

• Adds a workflow that deletes source branches after a PR is merged
• Explicitly excludes dev and release from deletion
• Replaces the repo-level delete_branch_on_merge setting which couldn't distinguish protected branches

Test plan

• Merge this PR → feature/cleanup-branches-workflow should be auto-deleted
• Merge dev → release → dev should remain untouched

🤖 Generated with Claude Code

[github-actions]

Qodana Community for .NET

75 new problems were found

Inspection name	Severity	Problems
Inconsistent Naming	🔶 Warning	62
Access to disposed captured variable	🔶 Warning	1
Convert constructor into primary constructor	◽️ Notice	4
Convert lambda expression into method group	◽️ Notice	2
Class is never instantiated: Private accessibility	◽️ Notice	1
For-loop can be converted into foreach-loop	◽️ Notice	1
Redundant type declaration body	◽️ Notice	1
Type member is never used: Non-private accessibility	◽️ Notice	1
Method return value is never used: Non-private accessibility	◽️ Notice	1
Use object or collection initializer when possible	◽️ Notice	1

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