ci: skip doctests when no doc examples changed

[QuantumExplorer]

Summary

• Add doctest change detection to the changes job — checks if any added/removed lines in .rs files contain doc comments with code fences (```)
• Only run the doctests job when doc examples actually changed, or when CI workflows changed
• Previously doctests ran on every Rust file change, even when no doc comments were modified
• Always runs on workflow_dispatch

Test plan

• Verify doctests are skipped when only non-doc Rust code changes
• Verify doctests run when doc comments with ``` are modified
• Verify doctests run on manual workflow dispatch

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: a5609c13-630c-4395-9adb-2c5bd943d021

📥 Commits

Reviewing files that changed from the base of the PR and between 76e38a8 and b66b3e8.

📒 Files selected for processing (2)

• .github/workflows/tests-rs-workspace.yml
• .github/workflows/tests.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-doctests-when-unchanged

📝 Coding Plan

• Generate coding plan for human review comments

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[QuantumExplorer]

Self Reviewed