why: release the FastMCP component cross-reference roles and the
:no-index: parity for prompt/resource/resource-template and argparse
directives.

what:
- Bump all workspace packages 0.0.1a30 -> 0.0.1a31
- Date CHANGES entry for 0.0.1a31 (2026-06-15)
- Add 0.0.1a32 unreleased header