chore: rename to mise.toml and introduce lockfile

[iwamot]

Summary

• Rename .mise.toml to mise.toml to match the mise.lock naming convention
• Add [settings] lockfile = true so mise install keeps the lockfile in sync
• Generate the initial mise.lock via mise lock (checksums and URLs for 7 platforms)

Skipping strict enforcement (locked = true) for now since Renovate does not yet support the mise lockfile — it would update mise.toml without updating mise.lock, breaking CI. Will revisit once Renovate adds support.

🤖 Generated with Claude Code

[github-actions]

Dependency Review

✅ No vulnerabilities found.

Snapshot Warnings

⚠️: No snapshots were found for the head SHA d434a85.

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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 (c939a9e) to head (d434a85).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #77   +/-   ##
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  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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[iwamot]

Renovate does not yet support the mise lockfile, so PRs that bump versions in mise.toml would not regenerate mise.lock and CI would fail. Will revisit once Renovate adds support.