Update coding-standard-rules description and reference in gv-brainstorming

skills/coding-standard-rules/SKILL.md

@@ -1,6 +1,7 @@
 ---
 name: coding-standard-rules
-description: Coding standards and style rules for writing, editing, refactoring, fixing, and reviewing code.
+description: |
+  Gate for all code work. Decision rule: if this task creates or alters any file that contains — or will contain — code, read SKILL.md before the first write or edit. Applies to any language, any size: single-line changes, scaffolding, examples, snippets, scripts, tests, and config with logic. Exempt are only tasks that touch no code at all (pure prose, docs-only edits, answers without code blocks).
 ---
 
 ## Code Writing Rules

skills/gv-brainstorming/SKILL.md

@@ -19,6 +19,7 @@ You **must** use `todos` tool to track progress and avoid skipping steps, else y
 
 ## 1. Brainstorm
 
+* Load skill `coding-standard-rules`.
 * Understand the objective.
 * Ask at most three material questions.
 * Do not ask what repository inspection can answer.