why: Cut a fresh dev release on top of the Phase 2 + Phase 3
consolidation so libtmux-mcp PR #33 (and any downstream consumer of
the workspace's PyPI packages) can pin to a version where
sphinx-vite-builder ships the working extension head, the hatchling
build-hook variant, and gp-sphinx-vite has been retired.

what:
- Bump 0.0.1a16.dev2 → 0.0.1a16.dev3 across all 16 workspace package
  pyproject.toml + __init__.py __version__ entries + uv.lock + the
  workspace root pyproject.toml + the smoke-test version assertions
- check-versions exits 0 with all packages aligned