ci: skip tests for doc-comment-only PRs

[QuantumExplorer]

Summary

• Automatically detect when a PR only changes doc comments (///, //!) in .rs files
• Skip the test suite and coverage upload for such PRs
• Linting and formatting still run (clippy checks doc formatting, rustfmt checks indentation)

How it works

The detect-changes job now has a needs-tests output in addition to any-code:

1. If build files (.toml, .lock) changed → tests always needed
2. If only .rs files changed on a PR → diff against the base branch, extract all added/removed lines, check if every non-blank line starts with /// or //!
3. If all changes are doc-only → needs-tests=false, test jobs are skipped
4. Push events to master/develop always run the full suite (the doc-check only runs for pull_request events)

Test plan

• A doc-comment-only PR (like docs: document cross-type aggregate safety (audit #11) #614 or docs: document why Owner::own_result poisoning is safe #626) should skip test jobs
• A PR with actual code changes should still run tests normally
• Push events to develop/master always run tests
• A PR that changes both doc comments and code runs tests

🤖 Generated with Claude Code

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: c3648b6d-0cc5-4209-ad94-6ac01fdf8b08

📥 Commits

Reviewing files that changed from the base of the PR and between 2d60ccf and 4af35a4.

📒 Files selected for processing (1)

• .github/workflows/grovedb.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch ci/skip-tests-for-doc-only

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