perf: optimize release workflow with caching, parallelization, and cleanup

[devin-ai-integration]

Summary

Restructures the release.yml workflow from a single monolithic job into three parallel/pipelined jobs to reduce wall-clock time:

Job	Purpose	Runs in parallel with
build	Compile JAR, verify, upload artifact	changelog
changelog	Full-depth checkout + generate release notes	build
release	Download artifacts, create GitHub Release	waits for both

Additional speed improvements:

• Caching: Added cache: 'gradle' to setup-java and upgraded to gradle/actions/setup-gradle@v4 (replaces deprecated gradle-build-action@v2)
• Gradle flags: Removed redundant clean (CI workspace is fresh), added --build-cache and --parallel
• Checkout: Build job uses shallow checkout (fetch-depth: 1); only changelog needs full history
• Cleanup: Removed dead runner.os != 'Windows' guard, macOS stat fallback, verbose echo headers in verify step, and unused changelog job output

Review & Testing Checklist for Human

• Artifact path structure in release job: upload-artifact@v4 with a multi-path path: block uploads build/libs/netmusiclist-*.jar and LICENSE.txt. On download, the directory structure may or may not be preserved — if download-artifact flattens paths, softprops/action-gh-release won't find the JAR at build/libs/netmusiclist-$VERSION.jar. Verify locally or with a test tag that the downloaded artifact layout matches the files: glob.
• softprops/action-gh-release without checkout: The release job has no actions/checkout step. Confirm this action resolves the tag from GITHUB_REF env var (set by the runner) rather than requiring a local .git directory.
• End-to-end test (required): Push a test tag (e.g. v0.0.0-test.1) to verify the full workflow. PR CI only exercises build.yml, not release.yml, so CI passing here does not validate the release flow. Check that: build artifacts are produced, changelog is generated, and the GitHub Release is created with the expected files attached.

Notes

• Emoji characters (📦, 📥) were removed from release notes section headers — cosmetic only.

Link to Devin session: https://app.devin.ai/sessions/402413976aa04d2883ea4d183ea3699c
Requested by: @1499501762

[devin-ai-integration]

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