feat: Add template system with testing showcase

Implements template-based project creation allowing teams to start with
professional example code instead of empty projects.

Features:
- Two templates: 'basic' (minimal) and 'testing' (45-test showcase)
- Template variable substitution ({{PROJECT_NAME}}, etc.)
- Template validation with helpful error messages
- `weevil new --list-templates` command
- Templates embedded in binary at compile time

Testing template includes:
- 3 complete subsystems (MotorCycler, WallApproach, TurnController)
- Hardware abstraction layer with mock implementations
- 45 comprehensive tests (unit, integration, system)
- Professional documentation (DESIGN_AND_TEST_PLAN.md, etc.)

Usage:
  weevil new my-robot                    # basic template
  weevil new my-robot --template testing # testing showcase
  weevil new --list-templates            # show available templates

This enables FTC teams to learn from working code and best practices
rather than starting from scratch.

All 62 tests passing.

templates/basic/src/main/java/robot/opmodes/BasicOpMode.java.template

@@ -1,86 +1,27 @@
-// Generated by Weevil {{WEEVIL_VERSION}} on {{CREATION_DATE}}
-package robot.{{PACKAGE_NAME}};
-
-import com.qualcomm.robotcore.eventloop.opmode.OpMode;
-import com.qualcomm.robotcore.eventloop.opmode.TeleOp;
-import com.qualcomm.robotcore.hardware.DcMotor;
+package robot.opmodes;
 
 /**
- * Basic OpMode template for {{PROJECT_NAME}}
+ * Basic OpMode for {{PROJECT_NAME}}
  * 
- * This is a minimal starting point for your robot code.
- * Add your hardware and control logic here.
+ * This is a placeholder to demonstrate project structure.
+ * To use this with FTC SDK:
+ * 1. Run: weevil deploy {{PROJECT_NAME}}
+ * 2. Add FTC SDK imports (OpMode, TeleOp, etc.)
+ * 3. Extend OpMode and implement methods
+ * 
+ * For local testing (without robot), write unit tests in src/test/java/robot/
+ * Run tests with: ./gradlew test
+ * 
+ * Created by Weevil {{WEEVIL_VERSION}}
+ * Template: {{TEMPLATE_NAME}}
  */
-@TeleOp(name = "{{PROJECT_NAME}}: Basic", group = "TeleOp")
-public class BasicOpMode extends OpMode {
+public class BasicOpMode {
     
-    // Declare your hardware here
-    // private DcMotor leftMotor;
-    // private DcMotor rightMotor;
+    // This placeholder compiles without FTC SDK dependencies
+    // Replace with actual OpMode code when deploying to robot
     
-    /**
-     * Initialize hardware and setup
-     */
-    @Override
-    public void init() {
-        // Initialize your hardware
-        // leftMotor = hardwareMap.get(DcMotor.class, "left_motor");
-        // rightMotor = hardwareMap.get(DcMotor.class, "right_motor");
-        
-        telemetry.addData("Status", "{{PROJECT_NAME}} initialized");
-        telemetry.addData("Created", "Weevil {{WEEVIL_VERSION}}");
-        telemetry.update();
-    }
-    
-    /**
-     * Runs repeatedly after init, before play
-     */
-    @Override
-    public void init_loop() {
-        telemetry.addData("Status", "Waiting for start...");
-        telemetry.update();
-    }
-    
-    /**
-     * Runs once when play is pressed
-     */
-    @Override
-    public void start() {
-        telemetry.addData("Status", "Running!");
-        telemetry.update();
-    }
-    
-    /**
-     * Main control loop - runs repeatedly during play
-     */
-    @Override
-    public void loop() {
-        // Add your control code here
-        
-        // Example: Read gamepad and control motors
-        // double leftPower = -gamepad1.left_stick_y;
-        // double rightPower = -gamepad1.right_stick_y;
-        // leftMotor.setPower(leftPower);
-        // rightMotor.setPower(rightPower);
-        
-        // Update telemetry
-        telemetry.addData("Status", "Running");
-        telemetry.addData("Project", "{{PROJECT_NAME}}");
-        // telemetry.addData("Left Power", leftPower);
-        // telemetry.addData("Right Power", rightPower);
-        telemetry.update();
-    }
-    
-    /**
-     * Runs once when stop is pressed
-     */
-    @Override
-    public void stop() {
-        // Stop all motors
-        // leftMotor.setPower(0);
-        // rightMotor.setPower(0);
-        
-        telemetry.addData("Status", "Stopped");
-        telemetry.update();
+    public static void main(String[] args) {
+        System.out.println("{{PROJECT_NAME}} - Ready for deployment");
+        System.out.println("Run: weevil deploy {{PROJECT_NAME}}");
     }
 }