Split mise min_version into hard and soft

[iwamot]

Summary

• Switch `min_version` in `.mise.toml` to the object form with `hard` and `soft`.
• `hard = 2026.4.8` keeps the real compatibility floor (the version where the current config was last known to fail below).
• `soft = 2026.4.9` is the recommended version that Renovate will continue to bump.
• Narrow the custom regex manager to match only `soft` so Renovate updates recommendations without touching the hard floor.

🤖 Generated with Claude Code

[github-actions]

Dependency Review

✅ No vulnerabilities found.

Snapshot Warnings

⚠️: No snapshots were found for the head SHA d76c3e7.

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Scanned Files

None

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 50.96%. Comparing base (3231200) to head (d76c3e7).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #75   +/-   ##
=======================================
  Coverage   50.96%   50.96%           
=======================================
  Files          26       26           
  Lines        1244     1244           
  Branches      178      178           
=======================================
  Hits          634      634           
  Misses        606      606           
  Partials        4        4           

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