fix(skill-author): resolve audit findings from post-#8 review

- Remove implementation-focused sentence from description (was not user-intent
  language per agentskills.io spec)
- Move source_keys template comment under metadata: block to match Step 5's
  instruction; contradicted agents scaffolding before reading Step 5
- Add Step 6 to new-skill.sh next-steps (populate references/sources.md);
  renumber validate step to 7 — script was missing the sources step entirely

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

plugins/kyberforge/skills/skill-author/SKILL.md

@@ -7,8 +7,7 @@ description: >
   audit findings", "update based on grill output"). Also use when the user
   provides inline feedback about a skill's behavior and wants it applied, or
   when a grill session, eval run, or audit has produced findings the user wants
-  acted on — even if they don't say "improve" explicitly. Authors and refines
-  skills following the agentskills.io specification. Do not use for read-only review — use
+  acted on — even if they don't say "improve" explicitly. Do not use for read-only review — use
   /skill-audit instead. Do not use to author agent definition files.
 allowed-tools: Bash Read Write Edit
 metadata: