fix(ci): sync hypatia-scan.yml to canonical (kill cd-scanner build drift)

The build step did `cd scanner` / built `hypatia-v2` against a path that
no longer exists in the hypatia repo (mix.exs is at root), so the Hypatia
Neurosymbolic Analysis lane exited 1 every run. The env.HOME and Phase-2
sweeps never normalised this older build-step drift. Replace with the
canonical rsr-template-repo hypatia-scan.yml.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: hyperpolymath