ci: clone godot-cpp directly so GDExtension build can find it

[Copilot]

The build-extension job failed at the CMake configure step with godot-cpp not found at .../godot-cpp. Although .gitmodules lists godot-cpp, it was never registered as a gitlink in the repo's index, so actions/checkout's submodules: recursive silently skipped it and the follow-up git submodule update --init -- godot-cpp || true was a no-op (its failure swallowed by || true).

Changes

• .github/workflows/build.yml: Replace the broken submodule step with a shallow git clone of the godot-4.2 branch (matching GODOT_VERSION: 4.2.2) into ${{ github.workspace }}/godot-cpp — the path already passed via -DGODOT_CPP_DIR. The step is idempotent: it skips cloning if godot-cpp/CMakeLists.txt is already present (e.g. from a future submodule fix).

- name: Fetch godot-cpp (matching Godot ${{ env.GODOT_VERSION }})
  run: |
    if [ ! -f godot-cpp/CMakeLists.txt ]; then
      rm -rf godot-cpp
      git clone --depth 1 --branch godot-4.2 https://github.com/godotengine/godot-cpp godot-cpp
    fi
  shell: bash

Notes / follow-ups

• JSBSim is unaffected; the workflow builds the stub via -DJSBSIM_ENABLED=OFF.
• The underlying .gitmodules entries for godot-cpp and jsbsim are orphaned (no corresponding gitlink). Worth cleaning up in a separate change — either properly registering them as submodules or removing the stale entries.

Original prompt

You are an expert open-source game developer and a senior Godot 4 engineer.
You will act as the lead architect of "RC-Flight-Sim", a free, community-driven, open-source R/C flight simulator.
Use the following comprehensive blueprint to generate all initial project files, code, documentation, and CI/CD configuration.

==============================================================================
PROJECT: RC-Flight-Sim
REPOSITORY: https://github.com/DaScient/RC-Flight-Sim
LICENSE: MIT for code, CC0/CC-BY-SA for art assets
OWNER: DASCIENT, INC. | 2026

1. CORE DESIGN PILLARS

• Accessible & Lightweight: Runs on Intel HD 4000 integrated graphics (GLES3 backend), scaling up to high-end GPUs with Vulkan, dynamic shadows, post-processing.
• Physics Realism: Full 6‑DOF aerodynamics via JSBSim (stall, spin, knife‑edge, torque‑roll, P‑factor, ground effect). Support for foam parkflyers, 3D aerobats, turbine jets.
• Universal Controller Support: Automatically recognizes any USB RC dongle (HID joystick), gamepads (Xbox, PlayStation), keyboard, and touch. Calibration wizard with endpoint/direction/deadzone/curve settings.
• Diverse Flying Environments: Photorealistic outdoor airfields, indoor arenas, dynamic time‑of‑day, weather (wind affects FDM).
• Multiple Viewpoints: Cockpit (FPV), chase (3rd person with configurable spring arm), stationary tripod (pilot box), tower, free orbit.
• Modular & Extensible: Aircraft, sceneries, and physics are data‑driven (XML/JSON). Hot‑loading of addons. Community can create content without touching engine code.

2. TECHNOLOGY STACK (100% free & open source)

• Game Engine: Godot 4.x (MIT) – lightweight, excellent 3D, easy scripting, cross‑platform (Windows, Linux, macOS, Android, Web)
• Flight Dynamics: JSBSim (LGPL) integrated as a GDExtension (C++ library). Aircraft defined via XML files.
• Terrain: Terrain3D addon for Godot (high‑performance GPU terrain, heightmaps, satellite textures)
• Input: Godot’s built-in Input system (SDL backend), no special drivers needed
• Networking (future): Godot ENet or WebRTC
• Audio: Godot AudioServer + free sound libraries (Freesound) for prop, EDF, turbine sounds, doppler
• UI: Godot Control nodes, fully themable, localization ready
• Starter Assets: CC0 models from Kenney.nl, OpenGameArt; we will provide basic aircraft: high‑wing trainer, 3D aerobat, scale jet.

3. REPOSITORY STRUCTURE (initial commit)
   Create the following exact folder tree in a Godot 4 project. Include all necessary files (even if empty stubs) and fill them according to the sections below.

RC-Flight-Sim/
├── godot_project/
│   ├── assets/
│   │   ├── aircraft/
│   │   │   ├── trainer/
│   │   │   ├── aerobat/
│   │   │   └── jet/
│   │   ├── sceneries/
│   │   │   └── default_airfield/
│   │   └── ui/
│   │       ├── fonts/
│   │       ├── icons/
│   │       └── themes/
│   ├── scripts/
│   │   ├── autoload/
│   │   │   ├── input_manager.gd
│   │   │   ├── settings_manager.gd
│   │   │   └── scene_manager.gd
│   │   ├── flight_sim/
│   │   │   ├── fdm_interface.gd
│   │   │   ├── aircraft_node.gd
│   │   │   └── atmosphere.gd
│   │   ├── camera/
│   │   │   ├── camera_manager.gd
│   │   │   ├── fpv_camera.gd
│   │   │   ├── chase_camera.gd
│   │   │   ├── stationary_camera.gd
│   │   │   ├── tower_camera.gd
│   │   │   └── free_orbit_camera.gd
│   │   ├── controller/
│   │   │   └── calibration_wizard.gd
│   │   └── ui/
│   │       ├── main_menu.gd
│   │       ├── settings_menu.gd
│   │       └── hud.gd
│   ├── addons/
│   │   ├── terrain_3d/      (git submodule or copy)
│   │   └── jsbsim_gdextension/
│   │       ├── src/
│   │       │   └── jsbsim_extension.cpp
│   │       ├── CMakeLists.txt
│   │       └── jsbsim_extension.gdextension
│   ├── scenes/
│   │   ├── main.tscn
│   │   ├── aircraft/
│   │   ├── sceneries/
│   │   └── ui/
│   ├── project.godot
│   └── README.md
├── docs/
│   ├── aircraft_creation.md
│   ├── scenery_creation.md
│   ├── contributing.md
│   └── build_instructions.md
├── bin/
│   └── (precompiled JSBSim extension binaries per platform, initially empty)
├── .github/
│   ├── ISSUE_TEMPLATE/
│   │   ├── bug_report.md
│   │   └── feature_request.md
│   ├── workflows/
│   │   └── build.yml
│   └── CONTRIBUTING.md
├── LICENSE
└── build-prompt.txt   (this file)

4. TECHNICAL MODULE IMPLEMENTATION DETAILS

A. Controller Integration (scripts/controller/)

• On startup, input_manager.gd (autoload) enumerates all joysticks using Input.get_connected_joypads().
• It loads a controller_profiles.cfg file (INI format) keyed by GUID. Default mapping: axes 0‑3 → Aileron, Elevator, Throttle, Rudder.
• Provide a calibration wizard (calibration_wizard.gd) that guides the user to move sticks to endpoints, set center trims, reverse axes, set deadzones.
• Allow per‑model expo/dual‑rates stored in aircraft config. Input actions are defined in project.godot (e.g., rc_aileron,...

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