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>

_bmad/wds/skills/handoff.md

@@ -0,0 +1,91 @@
+# /handoff — Cross-Agent Handoff
+
+Pass a specific piece of work to another WDS agent. This is NOT a session wrap — it is a targeted transfer of one task or artifact to a different agent.
+
+**Usage:** `/handoff [target-agent]`
+**Example:** `/handoff mimir`
+
+---
+
+<handoff-steps>
+
+  <constraints>
+    - Derive everything from the conversation. Do NOT ask questions.
+    - Do NOT summarize this session. That is a wrap, not a handoff.
+    - Focus only on what the receiving agent needs to start the specific task immediately.
+    - Handoff is written to `progress/[target_agent].md` — the receiving agent picks it up via `/start`.
+  </constraints>
+
+  <step id="1-compile">
+    Determine:
+    - `target_agent` — from the argument. If none: infer from context (strategy → saga, design → freya, implementation → mimir).
+    - `from_agent` — your current agent base name.
+    - `project` — current project repo name.
+
+    Compose the handoff content — what the receiving agent needs to start immediately:
+
+    ```
+    ## Task
+    [Single specific task being handed off. What it is, what state it's in, what remains.]
+
+    ## Files
+    [Full absolute paths to every relevant file. The receiving agent should never have to search for them.]
+
+    ## Next
+    [Single immediately-actionable next step for the receiving agent.]
+    ```
+
+    This is task context, not session history. Always include full absolute file paths — never just filenames. If the receiving agent doesn't need something to do the task, leave it out.
+  </step>
+
+  <step id="2-show">
+    Print EXACTLY this block:
+
+    ── Handoff to [target_agent] ─────────────────
+    Task:    [one-line task description]
+    Next:    [the Next line you composed]
+    ──────────────────────────────────────────────
+
+    Then proceed immediately to step 3.
+  </step>
+
+  <step id="3-write">
+    Spawn a sub-agent with this exact prompt — substitute the bracketed values:
+
+    ---
+    You are a handoff writer. Your only job is to save a handoff file via the memory tool.
+
+    **Step A — Save handoff via memory tool:**
+    Read `~/.claude/wds/tools/memory/SKILL.md` and follow the `save` operation:
+    - agent_id: [target_agent]
+    - data:
+    ```
+    ## Wrapped
+    [current date and time]
+
+    ## Context
+    [task content from step 1]
+
+    ## Next
+    [next line from step 1]
+
+    ## Learned
+    None
+
+    ## Spec Sync
+    None
+    ```
+
+    **Step B — Confirm:**
+    Return ONLY: `done`
+    ---
+
+    Wait for the sub-agent to return. Then print EXACTLY this — nothing before, nothing after:
+    ```
+    /[target_agent] progress/[target_agent].md
+    ```
+
+    Session continues.
+  </step>
+
+</handoff-steps>