Add janet-lang scripting support

[Copilot]

This PR adds janet-lang as a third scripting language option to Gauzarbeit, alongside the existing Lua and JavaScript (QuickJS) support.

What's Added

Core Implementation

• ScriptedThing_Janet class following the same architectural pattern as ScriptedThing (Lua) and ScriptedThing_JS (JavaScript)
• Janet runtime integration with proper initialization and cleanup via Init() and DeInit() methods
• Script loading system supporting both global initialization scripts and per-thing scripts

File Structure

include/script/ScriptedThing_Janet.hpp  # Janet scripting interface
src/script/ScriptedThing_Janet.cpp      # Implementation
scripts/Init.janet                      # Global Janet initialization
scripts/things/*.janet                  # Per-thing Janet scripts

Integration

• Updated main.cpp to initialize Janet scripting system alongside Lua and JavaScript
• Updated makefile to link against janet library (-ljanet)
• Added janet include paths and dependencies

Usage Example

// Initialize Janet scripting
ScriptedThing_Janet::Init();

// Create a Janet-scripted game object
auto grape = std::make_shared<ScriptedThing_Janet>("JanetGrape");

// Cleanup
ScriptedThing_Janet::DeInit();

Janet scripts can define variables, functions, and game logic:

# scripts/things/JanetGrape.janet
(def grape-sweetness 85)
(def grape-size (* 2.5 3))

(defn doInit []
  "Initialize the grape object")

Implementation Notes

• Minimal changes: No modifications to existing Lua or JavaScript scripting systems
• Consistent architecture: Follows the same pattern as existing scripting implementations
• Error handling: Proper compilation and runtime error reporting with detailed logging
• Future extensible: Basic framework in place for adding C++ function bindings (getName, getStat, etc.)

Verified Functionality

✅ Janet runtime initialization and cleanup
✅ Global initialization script loading (scripts/Init.janet)
✅ Per-thing script loading (scripts/things/name.janet)
✅ Script compilation and execution
✅ Error handling and logging

The implementation provides a solid foundation for janet-lang scripting in Gauzarbeit, giving developers a third scripting option with Janet's unique functional programming features and excellent C interop capabilities.

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