Address PR review comments from elopez

- Update build command to use default behavior (builds both sdist and wheel)
- Remove ISSUE_DRAFT.md (unrelated to PR)
- Update README to use 'uv tool install' instead of 'uv pip install'
- Remove redundant version validation (already handled by arg parser)
- Remove unnecessary URL scheme validation (URLs always HTTPS from get_url)
- Replace custom ARM detection with existing mac_can_run_intel_binaries()
- Remove forced arch -x86_64 wrapper to let Rosetta handle automatically