docs(skills): добавлено описание cold review в brainstorm-with-docs

- Зачем:
  - расширить методологию ревью артефактов после мозгового штурма.
- Что:
  - добавлен абзац о cold review и порядке работы с его находками в SKILL.md.
- Проверка:
  - git show HEAD:agents/.agents/skills/brainstorm-with-docs/SKILL.md | grep -A 5 'cold review'

agents/.agents/skills/brainstorm-with-docs/SKILL.md

@@ -254,6 +254,17 @@ to the user instead: neither fix it silently nor suppress it. Reopening a
 decision is the user's call. This re-read is cheap and regularly catches both
 kinds.
 
+A **cold review** — a fresh agent with no shared context — inverts that trade:
+it reads the artifact and the repository, never the conversation, so it is
+strong on facts and contradictions and weak on fit — on proportion, on what
+belongs here, and on what the user already settled. Its findings are evidence,
+not orders: verify each against the artifact and the repo, then dispose of it
+by the same split as above. Rejecting a finding is a normal outcome. A finding
+that argues against something the user settled in conversation is a reviewer
+working without that turn, not a defect — report the argument as a
+decision-level find. A pass where you rejected nothing is a reason to re-read
+what you took on trust.
+
 Then go to `<stop_condition>`.
 
 </how_to_do_it>