Freeze the current workspace-first surface as the stable 3.0 contract and reposition the
landing docs, CLI help, and public contract around the stable workspace path after the
one-shot proof.
Bump the package and catalog compatibility to 3.0.0, add a dedicated workspace walkthrough
tape/GIF, and mark the 3.0.0 roadmap milestone done while keeping runtime capability
unchanged in this release.
Validation: uv lock; UV_CACHE_DIR=.uv-cache make check; UV_CACHE_DIR=.uv-cache make dist-check;
UV_CACHE_DIR=.uv-cache uv build; UV_CACHE_DIR=.uv-cache uvx --from twine twine check dist/*;
built-wheel CLI smoke for pyro --help and pyro workspace --help; vhs validate plus rendered
workspace-first-run.gif outside the sandbox because vhs crashes when sandboxed.
