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-checkpoint-preview/step-04-testing.md

@@ -0,0 +1,74 @@
+# Step 4: Testing
+
+Display: `Orientation → Walkthrough → Detail Pass → [Testing]`
+
+## Follow Global Step Rules in SKILL.md
+
+- This is **experiential**, not analytical. The detail pass asked "did you think about X?" — this says "you could see X with your own eyes."
+- Do not prescribe. The human decides whether observing the behavior is worth their time. Frame suggestions as options, not obligations.
+- Do not duplicate CI, test suites, or automated checks. Assume those exist and work. This is about manual observation — the kind of confidence-building no automated test provides.
+- If the change has no user-visible behavior, say so explicitly. Do not invent observations.
+
+## IDENTIFY OBSERVABLE BEHAVIOR
+
+Scan the diff and spec for changes that produce behavior a human could directly observe. Categories to look for:
+
+- **UI changes** — new screens, modified layouts, changed interactions, error states
+- **CLI/terminal output** — new commands, changed output, new flags or options
+- **API responses** — new endpoints, changed payloads, different status codes
+- **State changes** — database records, file system artifacts, config effects
+- **Error paths** — bad input, missing dependencies, edge conditions
+
+For each observable behavior, determine:
+
+1. **What to do** — the specific action (command to run, button to click, request to send)
+2. **What to expect** — the observable result that confirms the change works
+3. **Why bother** — one phrase connecting this observation to the change's intent (omit if obvious from context)
+
+Target 2–5 suggestions for a typical change. If more than 5 qualify, prioritize by how much confidence the observation provides relative to effort. A change with zero observable behavior is fine — do not pad with trivial observations.
+
+## PRESENT
+
+Output as a single message:
+
+```
+Orientation → Walkthrough → Detail Pass → [Testing]
+```
+
+Then the testing suggestions using this format:
+
+```
+### How to See It Working
+
+**{Brief description}**
+Do: {specific action}
+Expect: {observable result}
+
+**{Brief description}**
+Do: {specific action}
+Expect: {observable result}
+```
+
+Include code blocks for commands or requests where helpful.
+
+If the change has no observable behavior, replace the suggestions with:
+
+```
+### How to See It Working
+
+This change is internal — no user-visible behavior to observe. The diff and tests tell the full story.
+```
+
+### Closing
+
+End the message with:
+
+```
+---
+
+You've seen the change and how to verify it. When you're ready to make a call, just say so.
+```
+
+## NEXT
+
+When the human signals they're ready to make a decision about this {change_type}, read fully and follow `./step-05-wrapup.md`