ci: test mise rust cache

[risu729]

Summary

• point mise-action uses at risu729/mise-action@f205410 from feat: opt in to caching mise rust toolchains jdx/mise-action#467
• enable cache_rust: true where mise installs cached Rust toolchains
• remove the mise install --locked rust --force workaround steps

Verification

• actionlint .github/workflows/ci.yml .github/workflows/autofix.yml .github/workflows/release.yml .github/workflows/release-plz.yml
• pinact run --verify --check .github/workflows/ci.yml .github/workflows/autofix.yml .github/workflows/release.yml .github/workflows/release-plz.yml
• git diff --check

This PR is intended to verify that the mise-action Rust cache opt-in restores rustfmt/clippy correctly from cache.

[gemini-code-assist]

Note

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	biwa-docs	2a7c9f3	Commit Preview URL Branch Preview URL	May 10 2026, 03:59 PM

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 49.67%. Comparing base (7e848bd) to head (2a7c9f3).
⚠️ Report is 228 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #606      +/-   ##
==========================================
+ Coverage   41.28%   49.67%   +8.39%     
==========================================
  Files          16       21       +5     
  Lines         671     1387     +716     
==========================================
+ Hits          277      689     +412     
- Misses        394      698     +304     

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[risu729]

Verification notes:

• First run exercised cache_rust: true without the mise install --locked rust --force workaround; the Rust jobs passed, but zizmor flagged the temporary fork SHA.
• I added targeted zizmor suppressions for that temporary SHA only. Pinact did not require suppression.
• Second run restored a mise cache key containing -rust; cargo clippy and cargo fmt --check passed in Lint, and all checks are green.