fix(ci): accept breaking-change markers in the PR labeler title regex

[jamesarich]

The PR auto-labeler's conventional-commit title regex required the type/scope to be followed immediately by :, so titles carrying the breaking-change marker ! (e.g. refactor(car)!: remove the Android Auto integration, #6779) failed to match and the run ended with "No labels matched".

🐛 Bug Fixes

• Allow an optional ! before the colon in the labeler's title regex in .github/workflows/pull-request-target.yml (/^(\w+)(?:\(([^)]+)\))?:/ → /^(\w+)(?:\(([^)]+)\))?!?:/). Everything else in the script is unchanged.

Not changed, just noting: the branch-prefix fallback also doesn't help claude/-prefixed branches — branch.split(/[\/\-_]/)[0] yields claude, which maps to no label — so on such branches the title regex is the only type/scope signal. Left as-is deliberately.

Testing Performed

Workflow-only change, no Gradle tasks run. Verified the new regex against both title shapes in a JS scratch check: refactor(car)!: remove the Android Auto integration now matches (type refactor, scope car); plain fix(ci): ... titles match exactly as before.

🤖 Generated with Claude Code

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📥 Commits

Reviewing files that changed from the base of the PR and between fee0b35 and 71dab13.

📒 Files selected for processing (1)

• .github/workflows/pull-request-target.yml

✨ Finishing Touches 💡 1

🛠️ Fix failing CI checks 💡

• Create stacked PR
• Commit on current branch

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