fix(ci): set MIROBODY_VERSION env var for build instead of dead sed mirobody/__init__.py now resolves its version from the MIROBODY_VERSION env var at build time, so the old sed on `__version__ = "..."` matched nothing and every wheel built as the 0.0.0.dev0 sentinel. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>