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/README.md.template

@@ -0,0 +1,53 @@
+# {{PROJECT_NAME}}
+
+FTC Robot project created with Weevil {{WEEVIL_VERSION}} on {{CREATION_DATE}}.
+
+## Getting Started
+
+This is a minimal FTC robot project. Add your robot code in:
+- `src/main/java/robot/opmodes/` - OpModes for TeleOp and Autonomous
+- `src/main/java/robot/subsystems/` - Robot subsystems
+- `src/main/java/robot/hardware/` - Hardware abstractions
+
+## Building
+
+```bash
+# Setup environment (first time only)
+weevil setup
+
+# Build APK
+weevil build
+
+# Deploy to robot
+weevil deploy
+```
+
+## Project Structure
+
+```
+{{PROJECT_NAME}}/
+├── src/
+│   ├── main/java/robot/
+│   │   ├── hardware/      # Hardware interfaces
+│   │   ├── subsystems/    # Robot subsystems  
+│   │   └── opmodes/       # TeleOp and Autonomous
+│   └── test/java/robot/   # Unit tests
+├── build.gradle           # Build configuration
+└── README.md             # This file
+```
+
+## Next Steps
+
+1. Add your robot hardware in `src/main/java/robot/hardware/`
+2. Create subsystems in `src/main/java/robot/subsystems/`
+3. Write OpModes in `src/main/java/robot/opmodes/`
+4. Test and deploy!
+
+## Documentation
+
+- [Weevil Documentation](https://docs.weevil.dev)
+- [FTC SDK Documentation](https://ftc-docs.firstinspires.org)
+
+---
+
+Created with [Weevil](https://weevil.dev) - FTC Project Generator