feat(skills): добавлен скилл brainstorm-with-docs (v1)

- Зачем:
  - нужен ручной скилл для брейнсторма и дизайна, который удерживает
    словарь смыслов (CONTEXT.md) и лёгкие ADR, активно прожаривает план
    и не сваливается в реализацию.
- Что:
  - SKILL.md: процесс (контекст → классификация → декомпозиция →
    грилл → синтез опций → подтверждение → артефакт), единый HARD-GATE
    «исследуй, но не меняй состояние» с поправкой на auto mode.
  - artifacts/: шаблоны spec, research-note, adr, runbook, prd, context
    (по файлу на тип для progressive disclosure).
  - README.md с MIT-атрибуцией grill-with-docs (Pocock) и brainstorming
    (obra/superpowers); шов для будущей фазы дивергенции в шаге 5.
  - frontmatter переносим: Claude читает все поля, Codex — name+description.
- Проверка:
  - python3 yaml-парс frontmatter; markdown-ссылки на artifacts/ резолвятся.

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

@@ -0,0 +1,81 @@
+# brainstorm-with-docs
+
+A manually-invoked skill for **brainstorming, design alignment, and durable
+documentation** — grounded in a project's existing docs and vocabulary. It takes
+an unclear engineering, DevOps, architecture, migration, integration, research,
+or documentation problem and turns it into the *smallest useful* durable
+artifact: a spec, ADR, runbook, research note, or `CONTEXT.md` glossary update.
+
+It is deliberately **not** an implementation skill. It reads project files and
+proposes documentation, but stops before code, config, or infrastructure changes
+— approval of a design direction is never approval to implement.
+
+## Why this exists
+
+It combines three things that are usually separate:
+
+- **shared domain language** (glossary / `CONTEXT.md`) and **lightweight ADRs** —
+  the discipline of capturing terminology and durable decisions as they crystallise;
+- **active grilling** — not just extracting requirements, but pressure-testing
+  them: challenging terms against the glossary, sharpening fuzzy language, probing
+  with edge-case scenarios, cross-checking claims against the code;
+- **option exploration** — always comparing 2-3 viable approaches with trade-offs
+  before recommending a direction.
+
+## Usage
+
+Invoke manually:
+
+```
+/brainstorm-with-docs <problem-or-topic>
+```
+
+On **Claude Code** the skill is manual-only (`disable-model-invocation: true`) —
+it never auto-triggers; you always call it. On **Codex** that field is ignored
+(Codex reads only `name` + `description`), so it may auto-trigger on matching
+design tasks; the negative triggers in the description keep that disciplined.
+
+## Layout
+
+```
+brainstorm-with-docs/
+├── SKILL.md              # the skill: process, rules, grill mechanics
+├── README.md             # this file
+└── artifacts/            # output templates — read only the one you need
+    ├── spec.md           # solution design / engineering spec
+    ├── research-note.md  # exploratory, answer not yet known
+    ├── adr.md            # lightweight architectural decision record
+    ├── runbook.md        # operational procedure
+    ├── prd.md            # product-facing behaviour
+    └── context.md        # CONTEXT.md glossary format
+```
+
+Templates are split per type so the agent loads only what's relevant
+(progressive disclosure).
+
+## Roadmap
+
+- **v1 (current):** working hybrid — context inspection, glossary/ADR discipline,
+  active grilling, option comparison, durable artifacts, stop-before-implementation.
+- **v2 (planned):** a *divergence phase* before option synthesis (an
+  idea-generation toolkit plus the rule "at least one option the user didn't
+  already imply"), a "design for isolation" lens, and fuller multi-context
+  support. A `<!-- SEAM -->` marker in `SKILL.md` step 5 marks where it slots in.
+
+## Attribution
+
+This is a derived, original skill — not a copy of either source. It borrows ideas
+from two MIT-licensed projects:
+
+- **grill-with-docs / grill-me** by Matt Pocock —
+  <https://github.com/mattpocock/skills> (MIT, © 2026 Matt Pocock).
+  Source of the glossary/`CONTEXT.md` discipline, lightweight ADRs, and the
+  active grilling techniques.
+- **brainstorming** by Jesse Vincent (obra), from Superpowers —
+  <https://github.com/obra/superpowers> (MIT, © 2025 Jesse Vincent).
+  Source of the explore-context → question → compare-options → present-design flow
+  and the stop-before-implementation gate.
+
+The `CONTEXT.md` and ADR formats are adapted from Matt Pocock's `grill-with-docs`
+companion files. Both upstream projects are MIT-licensed; see their repositories
+for full license text.