gstack-relink linked SKILL.md from RENDER_DIR when a gbrain render was active
but ran gstack-patch-names only on INSTALL_DIR, so the served frontmatter kept
the unprefixed name and skill_prefix=true silently no-oped for every
brain-aware skill. The render tree (user-owned, untracked) is now patched too;
gstack-patch-names is idempotent so repeat relinks never double-prefix. The
gen-skill-docs note that pointed users at relink now describes what relink
actually covers.
Receipt: the new test fails on a v1.77.0.0 scratch worktree (served render
keeps 'name: qa').
Fixes#2738
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
