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/bmad-testarch-nfr/steps-c/step-04d-subagent-scalability.md

@@ -0,0 +1,88 @@
+---
+name: 'step-04d-subagent-scalability'
+description: 'Subagent: Scalability NFR evidence audit'
+subagent: true
+outputFile: '/tmp/tea-nfr-scalability-{{timestamp}}.json'
+---
+
+# Subagent 4D: Scalability NFR Evidence Audit
+
+## SUBAGENT CONTEXT
+
+This is an **isolated subagent** running in parallel with other NFR domain evidence audits.
+
+**Your task:** Assess SCALABILITY NFR domain only.
+
+---
+
+## SUBAGENT TASK
+
+### 1. Scalability Evidence Audit Categories
+
+**A) Horizontal Scaling:**
+
+- Stateless architecture
+- Load balancer configuration
+- Container orchestration (K8s)
+- Auto-scaling policies
+
+**B) Vertical Scaling:**
+
+- Resource allocation
+- Database size limits
+- Memory management
+- CPU optimization
+
+**C) Data Scaling:**
+
+- Database partitioning/sharding
+- Read replicas
+- Caching layers
+- Data archival strategy
+
+**D) Traffic Handling:**
+
+- CDN for static assets
+- Rate limiting
+- Queue systems for async work
+- WebSocket scaling
+
+---
+
+## OUTPUT FORMAT
+
+```json
+{
+  "domain": "scalability",
+  "risk_level": "MEDIUM",
+  "findings": [
+    {
+      "category": "Horizontal Scaling",
+      "status": "PASS",
+      "description": "Stateless architecture with container orchestration",
+      "evidence": ["Docker + Kubernetes setup", "Auto-scaling configured"],
+      "recommendations": []
+    },
+    {
+      "category": "Data Scaling",
+      "status": "CONCERN",
+      "description": "No database sharding strategy for large data growth",
+      "evidence": ["Single database instance", "No partitioning"],
+      "recommendations": ["Plan database sharding strategy", "Implement read replicas", "Consider database clustering"]
+    }
+  ],
+  "compliance": {
+    "1M_users": "PASS",
+    "10M_users": "CONCERN",
+    "100M_users": "FAIL"
+  },
+  "priority_actions": ["Design database sharding strategy for future growth", "Implement read replicas for read-heavy workloads"],
+  "summary": "Scalability is good up to 1M users, concerns for 10M+ users"
+}
+```
+
+---
+
+## EXIT CONDITION
+
+Subagent completes when JSON output written to temp file.