ci: trim dev release matrix

[im10furry]

Summary

• trim the main-branch dev release build matrix to routinely available runners: ubuntu-latest, macos-latest, and windows-latest
• remove scarce macos-13 and ubuntu-24.04-arm64 from the automatic dev prerelease path
• make newer main pushes cancel older dev release runs so stale queued builds do not block the latest run

Verification

• node -e "const fs=require('fs'); const yaml=require('js-yaml'); yaml.load(fs.readFileSync('.github/workflows/dev-release.yml','utf8')); console.log('dev-release.yml OK')"
• git diff --check

Note

Issue #77 is about /model missing Gemini, so this PR intentionally does not close that issue.