Update design doc ...

docs: D-002 hacluster row added + D-007 driver pin corrected

D-002: add hacluster | 2.4/stable row (Canonical Charm Delivery table,
       verified against Charmhub 2026-05-22). Update Verification
       source paragraph with rev confirmations.

D-007: Layer B driver pin stackhpc/magnum-capi-helm v0.13.0 →
       openstack/magnum-capi-helm 1.1.0 from PyPI. stackhpc fork
       archived Dec 2024; canonical project moved to opendev/PyPI.
       1.1.0 is last Caracal-cycle release. Note ASCII-only conf.d.
       Add explicit supersedes note for old pin.

Updated scope

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