ci: verify PR title spacing

[bladehan1]

What does this PR do?

Verify the PR-title spacing rule through a real GitHub pull request event.

Why are these changes required?

Confirm that a title without a space after the colon receives the dedicated validation error and that the corrected title passes PR Lint.

This PR has been tested by:

• GitHub Actions PR Lint with a missing-space title
• GitHub Actions PR Lint after correcting the title

Follow up

Close this temporary PR and remove its branch after collecting the validation evidence.

Extra details

This PR is for CI validation only and will not be merged.

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Summary by cubic

Enforces the PR title convention requiring a space after the colon in conventional commit titles, and adjusts CI workflows for caching and reviewer scope inference.

• PR titles without a space after the colon now receive a dedicated validation error with an example.
• Reviewer assignment now infers the ci scope for bare ci PR titles.
• Build and coverage jobs now reuse the Gradle build cache by dropping --no-build-cache.

^{Written for commit 6a93f7c. Summary will update on new commits.}

[coderabbitai]

Important

• 🔍 Trigger review

This repository does not receive automatic reviews because it has fewer than 10 stars.

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Team

Run ID: 20904b95-9141-45c5-a331-49f96d2ec821

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