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/04-concept.md

@@ -0,0 +1,82 @@
+# Step 4: Product Concept
+
+**Completed:** {{date}}
+**Session:** {{session_number}}
+
+---
+
+## Purpose
+
+Capture the designer's STRUCTURAL vision - the founding principle or key feature that defines the product concept.
+
+**Not just requirements - the IDEA.**
+
+---
+
+## Concept Exploration
+
+**Agent asked:**
+{{question_to_surface_concept}}
+
+**User described:**
+{{concept_description}}
+
+---
+
+## Deep Dive
+
+### Core Structural Idea
+
+**The founding principle:**
+{{what_makes_this_product_distinct}}
+
+**Concrete example:**
+{{specific_example_of_concept_in_action}}
+
+### Why This Matters
+
+**User's rationale:**
+{{why_this_approach}}
+
+**Problem it solves:**
+{{what_this_enables}}
+
+---
+
+## Reflection Checkpoint
+
+**Agent's synthesis:**
+{{understanding_of_concept}}
+
+**User response:**
+- [ ] Confirmed
+- [ ] Corrected
+
+**Corrections (if any):**
+{{corrections}}
+
+---
+
+## Concept Documentation
+
+**Core concept:**
+{{concept_statement}}
+
+**Implementation principle:**
+{{how_this_shapes_design}}
+
+**Example:** {{concrete_example}}
+
+---
+
+## Related Features
+
+Features that stem from this concept:
+1. {{feature_1}}
+2. {{feature_2}}
+3. {{feature_3}}
+
+---
+
+**Documented in:** `wds-project-outline.yaml` → `product_concept`
+**Impacts:** Navigation structure, information architecture, feature priorities