feat: Add template system to weevil new command

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
- Template files embedded in binary at compile time

Technical details:
- Templates stored in templates/basic/ and templates/testing/
- Files ending in .template have variables replaced
- Uses include_dir! macro to embed templates in binary
- Returns file count for user feedback

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.

templates/basic/src/main/java/robot/hardware/.gitkeep

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+# This file ensures the directory is tracked by git even when empty

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

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+// 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;
+
+/**
+ * Basic OpMode template for {{PROJECT_NAME}}
+ * 
+ * This is a minimal starting point for your robot code.
+ * Add your hardware and control logic here.
+ */
+@TeleOp(name = "{{PROJECT_NAME}}: Basic", group = "TeleOp")
+public class BasicOpMode extends OpMode {
+    
+    // Declare your hardware here
+    // private DcMotor leftMotor;
+    // private DcMotor rightMotor;
+    
+    /**
+     * 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();
+    }
+}

templates/basic/src/main/java/robot/subsystems/.gitkeep

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+# This file ensures the directory is tracked by git even when empty

templates/basic/src/test/java/robot/.gitkeep

@@ -0,0 +1 @@
+# This file ensures the directory is tracked by git even when empty