feat: add multi-project examples (giesing + fullstack) and examples README

examples/multi-project-fullstack.yaml

@@ -0,0 +1,49 @@
+# Example: Multi-project run — fullstack feature across a monorepo
+#
+# Typical pattern: a shared library is built first (Layer 0), then the
+# backend and frontend consume it in parallel (Layer 1). The DAG ensures
+# the shared types exist before dependent packages start.
+#
+# Invoke:
+#   archeflow:multi-project --config examples/multi-project-fullstack.yaml
+#   archeflow:multi-project --config examples/multi-project-fullstack.yaml --dry-run
+
+name: user-auth
+description: "Add user authentication across the stack"
+
+projects:
+  - id: shared
+    path: "packages/shared"
+    task: >
+      Add TypeScript auth types (User, Session, AuthToken, LoginRequest,
+      RegisterRequest) and JWT utility functions (sign, verify, decode)
+      with full test coverage. Export from package index.
+    workflow: fast
+    domain: code
+    depends_on: []
+
+  - id: backend
+    path: "packages/api"
+    task: >
+      Add auth middleware (JWT verification, role extraction), login and
+      register endpoints with bcrypt password hashing, refresh token
+      rotation, and integration tests against an in-memory DB.
+    workflow: standard
+    domain: code
+    depends_on: [shared]
+
+  - id: frontend
+    path: "packages/web"
+    task: >
+      Add login and register pages, an AuthContext provider with token
+      refresh, a ProtectedRoute wrapper, and Playwright e2e tests for
+      the login flow.
+    workflow: standard
+    domain: code
+    depends_on: [shared]
+
+budget:
+  total_usd: 10.00
+  per_project_usd: 5.00
+
+parallel: true