fix(plugin): prevent elaboration review PR from closing linked issues

Adds explicit instruction to not include "Closes", "Fixes", or
"Resolves" references in spec review PRs, since merging the
elaboration PR should not auto-close the issue.

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

Author: jwaldrip

plugin/skills/elaborate/SKILL.md

@@ -1269,6 +1269,8 @@ Your main working directory stays clean on the main branch.
 
 ### If PR/MR for review:
 
+**IMPORTANT:** Do NOT include "Closes", "Fixes", or "Resolves" issue references in the PR body. This is a spec review PR — merging it must not auto-close the linked issue. The issue stays open until construction is complete.
+
 1. Push the intent branch to remote:
 
 ```bash