ci: consolidate formatting and clippy into workspace-wide jobs

[QuantumExplorer]

Summary

• Move per-package cargo fmt and cargo clippy checks from tests-rs-package.yml into workspace-wide jobs in tests-rs-workspace.yml
• Mac runner runs cargo fmt --check --all and cargo clippy --workspace before tests (fast failure)
• New Ubuntu "Formatting & Linting" fallback job with the same Mac availability check pattern
• Reduces runner count from N (one per changed package) to 1 for formatting and linting
• Per-package unused_deps, detect_structure_changes, and check_each_feature jobs are unchanged

Test plan

• Verify cargo fmt --check --all runs on Mac runner
• Verify cargo clippy --workspace runs on Mac runner
• Verify Ubuntu lint fallback skips when Mac is available
• Verify per-package lint/formatting jobs no longer appear

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 80f5b9ca-93c5-4d2c-b640-59f2f59dc9fd

📥 Commits

Reviewing files that changed from the base of the PR and between 16ad0c0 and b3fc098.

📒 Files selected for processing (3)

• .github/workflows/tests-rs-doctests.yml
• .github/workflows/tests-rs-package.yml
• .github/workflows/tests-rs-workspace.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/consolidate-fmt-clippy

📝 Coding Plan

• Generate coding plan for human review comments

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