feat: extend Makefile with testing and validation commands, expand help section

- Added new targets for testing (`test`, `test-backend`, `test-mcp`, `test-frontend`, etc.) and validation (`validate`, `validate-all`).
- Enhanced help section to reflect updates, including detailed descriptions for testing, validation, and new MCP-specific commands.
- Improved developer workflow by centralizing testing and linting processes in the Makefile.

Makefile

@@ -1,18 +1,31 @@
 .PHONY: help dev dev-full prod down logs logs-dev clean clean-slate drop-db reset-db push-images deploy
+.PHONY: test test-backend test-mcp test-frontend test-all test-cov test-integration validate validate-all
 
 VERSION ?= latest
 REGISTRY ?= ghcr.io/cardosofelipe/pragma-stack
 
 # Default target
 help:
-	@echo "FastAPI + Next.js Full-Stack Template"
+	@echo "Syndarix - AI-Powered Software Consulting Agency"
 	@echo ""
 	@echo "Development:"
-	@echo "  make dev           - Start backend + db (frontend runs separately)"
+	@echo "  make dev           - Start backend + db + MCP servers (frontend runs separately)"
 	@echo "  make dev-full      - Start all services including frontend"
 	@echo "  make down          - Stop all services"
 	@echo "  make logs-dev      - Follow dev container logs"
 	@echo ""
+	@echo "Testing:"
+	@echo "  make test          - Run all tests (backend + MCP servers)"
+	@echo "  make test-backend  - Run backend tests only"
+	@echo "  make test-mcp      - Run MCP server tests only"
+	@echo "  make test-frontend - Run frontend tests only"
+	@echo "  make test-cov      - Run all tests with coverage reports"
+	@echo "  make test-integration - Run MCP integration tests (requires running stack)"
+	@echo ""
+	@echo "Validation:"
+	@echo "  make validate      - Validate backend + MCP servers (lint, type-check, test)"
+	@echo "  make validate-all  - Validate everything including frontend"
+	@echo ""
 	@echo "Database:"
 	@echo "  make drop-db       - Drop and recreate empty database"
 	@echo "  make reset-db      - Drop database and apply all migrations"
@@ -28,8 +41,10 @@ help:
 	@echo "  make clean-slate   - Stop containers AND delete volumes (DATA LOSS!)"
 	@echo ""
 	@echo "Subdirectory commands:"
-	@echo "  cd backend && make help   - Backend-specific commands"
-	@echo "  cd frontend && npm run    - Frontend-specific commands"
+	@echo "  cd backend && make help              - Backend-specific commands"
+	@echo "  cd mcp-servers/llm-gateway && make   - LLM Gateway commands"
+	@echo "  cd mcp-servers/knowledge-base && make - Knowledge Base commands"
+	@echo "  cd frontend && npm run               - Frontend-specific commands"
 
 # ============================================================================
 # Development
@@ -99,3 +114,72 @@ clean:
 # WARNING! THIS REMOVES CONTAINERS AND VOLUMES AS WELL - DO NOT USE THIS UNLESS YOU WANT TO START OVER WITH DATA AND ALL
 clean-slate:
 	docker compose -f docker-compose.dev.yml down -v --remove-orphans
+
+# ============================================================================
+# Testing
+# ============================================================================
+
+test: test-backend test-mcp
+	@echo ""
+	@echo "All tests passed!"
+
+test-backend:
+	@echo "Running backend tests..."
+	@cd backend && IS_TEST=True uv run pytest tests/ -v
+
+test-mcp:
+	@echo "Running MCP server tests..."
+	@echo ""
+	@echo "=== LLM Gateway ==="
+	@cd mcp-servers/llm-gateway && uv run pytest tests/ -v
+	@echo ""
+	@echo "=== Knowledge Base ==="
+	@cd mcp-servers/knowledge-base && uv run pytest tests/ -v
+
+test-frontend:
+	@echo "Running frontend tests..."
+	@cd frontend && npm test
+
+test-all: test test-frontend
+	@echo ""
+	@echo "All tests (backend + MCP + frontend) passed!"
+
+test-cov:
+	@echo "Running all tests with coverage..."
+	@echo ""
+	@echo "=== Backend Coverage ==="
+	@cd backend && IS_TEST=True uv run pytest tests/ -v --cov=app --cov-report=term-missing
+	@echo ""
+	@echo "=== LLM Gateway Coverage ==="
+	@cd mcp-servers/llm-gateway && uv run pytest tests/ -v --cov=. --cov-report=term-missing
+	@echo ""
+	@echo "=== Knowledge Base Coverage ==="
+	@cd mcp-servers/knowledge-base && uv run pytest tests/ -v --cov=. --cov-report=term-missing
+
+test-integration:
+	@echo "Running MCP integration tests..."
+	@echo "Note: Requires running stack (make dev first)"
+	@cd backend && RUN_INTEGRATION_TESTS=true IS_TEST=True uv run pytest tests/integration/ -v
+
+# ============================================================================
+# Validation (lint + type-check + test)
+# ============================================================================
+
+validate:
+	@echo "Validating backend..."
+	@cd backend && make validate
+	@echo ""
+	@echo "Validating LLM Gateway..."
+	@cd mcp-servers/llm-gateway && make validate
+	@echo ""
+	@echo "Validating Knowledge Base..."
+	@cd mcp-servers/knowledge-base && make validate
+	@echo ""
+	@echo "All validations passed!"
+
+validate-all: validate
+	@echo ""
+	@echo "Validating frontend..."
+	@cd frontend && npm run validate
+	@echo ""
+	@echo "Full validation passed!"