docs(kyberforge): restore the retrofit cut order in skill-author

improve.md still required a retrofit before extending but lost the
procedure with retrofit.md. Restore the ordered cuts inline, and fix
the stale hook name and plugin-mode wording in skill-author's tests and
deployment-modes reference.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

plugins/kyberforge/.apm/skills/skill-author/tests/new-skill.bats

@@ -146,7 +146,7 @@ EOF
 }
 
 @test "scaffold emits a live metadata.version seeded at 0.1.0 (ADR-0022)" {
-    # The scaffold must clear .pre-commit-config.yaml's `skill-frontmatter` hook
+    # The scaffold must clear .pre-commit-config.yaml's `skill-size-check` hook
     # on its first commit: a commented-out metadata block ships a skill with no
     # version and is blocked. Assert the field is live, not a comment.
     bash "$SCRIPT" my-tool "$DEST"