docs(skills): brainstorm-with-docs — дивергенция v2: веер, развилки, маршрутизация

Приземлён блок дивергенции из ROADMAP по итогам второго живого теста
(wayfinder-карта #26 стенда): шаг 5 разделён на веер и конвергенцию,
ширина веера — по весу решения, развилки решаются по месту в интервью.
Триггер «развилка» в description; описание и правила подрезаны по ревью
writing-great-skills. Свидетельства и доводы — в ROADMAP.md.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

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

@@ -70,13 +70,14 @@ Templates are split per type so the agent loads only what's relevant
 
 ## Roadmap
 
-- **v1 (current):** working hybrid — context inspection, glossary/ADR discipline,
+- **v1:** working hybrid — context inspection, glossary/ADR discipline,
   active grilling, option comparison with an additive framing-challenger, durable
   artifacts, stop-before-implementation.
-- **v2 (planned):** tiered fuller divergence for heavier decisions, an
-  idea-generation toolkit, a "design for isolation" lens, and fuller
-  multi-context support. A `<!-- SEAM -->` marker in `SKILL.md` step 5 marks where
-  it slots in.
+- **v2 divergence (current):** step 5 is a diverge-then-converge split — frame
+  restatement, mandatory frame-challenger and null option, fan width tiered by
+  decision weight, an idea-generation toolkit with WHEN-triggers, a diversity
+  self-check, and fork-in-place grilling during the interview (step 4).
+- **Remaining:** a "design for isolation" lens and fuller multi-context support.
 
 See [ROADMAP.md](ROADMAP.md) for the full backlog, pending decisions, and what
 has been considered and rejected. `ROADMAP.md` is development memory and can be