chore: initial monorepo scaffold + WDS Phase 1+2 artifacts

- Nx 22.7 monorepo (pnpm 11.1, TypeScript 5.9, Node 24)
- apps/api: NestJS 11 (CJS conforme CODING-RULES.md PGD-DB-004)
- apps/web: React 19 + Vite 8 (ESM)
- libs/shared/api-interface: Zod contract base
- Docker Compose dev: Postgres 18, Valkey 8, MinIO, Mailpit
- WDS artifacts:
  - design-artifacts/A-Product-Brief/ (5 docs canônicos + 16 dialogs)
  - design-artifacts/B-Trigger-Map/ (hub + 4 personas + feature impact)
- Stack canon: STACK.md v2.2 + CODING-RULES.md v2.0 + brand.md
- AGENTS.md + README.md como entrada para devs/agentes

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.agents/skills/wds-1-project-brief/templates/project-brief-dialog/07-positioning.md

@@ -0,0 +1,86 @@
+# Step 7: Positioning
+
+**Completed:** {{date}}
+**Session:** {{session_number}}
+
+---
+
+## Positioning Exploration
+
+**Agent asked:**
+{{opening_question_about_positioning}}
+
+**User's initial response:**
+{{first_response}}
+
+---
+
+## Key Exchanges
+
+### Differentiation
+
+**Agent:** {{question_about_difference}}
+**User:** {{response}}
+
+**What this revealed:**
+{{insight_about_unique_angle}}
+
+---
+
+### Market Context
+
+**Agent:** {{question_about_alternatives}}
+**User:** {{response}}
+
+**What this revealed:**
+{{insight_about_competitive_landscape}}
+
+---
+
+### Value Proposition
+
+**Agent:** {{question_about_value}}
+**User:** {{response}}
+
+**What this revealed:**
+{{insight_about_core_value}}
+
+---
+
+## Reflection Checkpoint
+
+**Agent's synthesis:**
+{{positioning_understanding}}
+
+**User response:**
+- [ ] Confirmed
+- [ ] Corrected
+
+**Corrections (if any):**
+{{corrections}}
+
+---
+
+## Positioning Statement
+
+{{positioning_statement}}
+
+**For:** {{target_user}}
+**Who:** {{their_situation}}
+**This product:** {{what_it_is}}
+**That:** {{key_benefit}}
+**Unlike:** {{alternatives}}
+**Our approach:** {{differentiation}}
+
+---
+
+## Supporting Evidence
+
+**Why this position makes sense:**
+1. {{rationale_1}}
+2. {{rationale_2}}
+3. {{rationale_3}}
+
+---
+
+**Documented in:** `wds-project-outline.yaml` → `positioning`