why: release the fastmcp duplicate-ID fix — tool cards keep a single
canonical fastmcp-tool-<slug> anchor and the bare slug survives as a
label alias, so same-slug page headings no longer collide.

what:
- Bump all workspace packages 0.0.1a26 → 0.0.1a27
- Date CHANGES entry for 0.0.1a27 (2026-06-06)
- Add 0.0.1a28 unreleased header