[autoresearch] baseline: system prompt quality tests (5/5 passing)

.agents/rules/project-structure-go-backend.md

@@ -0,0 +1,59 @@
+---
+trigger: model_decision
+description: When working on a Go backend project, setting up Go project structure, or organizing Go services and APIs
+---
+
+## Go Backend Layout
+
+Use this structure for Go backend applications. The vertical slice principle applies — features are packages, not layers.
+
+```
+  apps/
+    backend/                          # Backend application source code
+      cmd/
+        api/
+          main.go                     # Entry point: Wires dependencies, router, starts server
+      internal/                       # Private application code
+        platform/                     # Foundational technical concerns (The "Framework")
+          database/                   # DB connection logic
+          server/                     # HTTP server setup (Router, Middleware)
+          logger/                     # Structured logging setup
+        features/                     # Business Features (Vertical Slices)
+          task/                       # Task management
+            # --- Interface Definition ---
+            service.go                # The public API of this feature (Service struct)
+
+            # --- Delivery (HTTP) ---
+            handler.go                # HTTP Handlers
+            handler_test.go           # Component tests (httptest + mock service)
+
+            # --- Domain (Business Logic) ---
+            logic.go                  # Core business logic methods
+            logic_test.go             # Unit tests (Pure functions + mock storage)
+            models.go                 # Domain structs (Task, NewTaskRequest)
+            errors.go                 # Feature-specific errors
+
+            # --- Storage (Data Access) ---
+            storage.go                # Storage Interface definition
+            storage_pg.go             # Postgres implementation
+            postgres_integration_test.go # Integration tests (Real DB/Testcontainers)
+            storage_mock.go           # Mock implementation
+            ...
+          order/                      # Order management
+            handler.go
+            logic.go
+            storage.go
+          ...
+```
+
+**Key Go conventions:**
+- `cmd/` for entry points — each subdirectory is a separate binary
+- `internal/` for private packages — enforced by Go compiler (cannot be imported externally)
+- `platform/` for foundational concerns (database, server, logger)
+- `features/` for vertical business slices — each feature is self-contained
+- Tests live alongside the code they test (`_test.go` suffix)
+- `go.mod` at the root — single module for the entire application
+
+### Related Principles
+- Project Structure @project-structure.md (core philosophy)
+- Go Idioms and Patterns @go-idioms-and-patterns.md (coding idioms, error handling, naming)