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feat: Add ImGui-based developer console overlay

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Integrates Dear ImGui for an in-game debug console that replaces the
blocking Python REPL. Press ~ (grave/tilde) to toggle the console.

Features:
- Python code execution without blocking the game loop
- Output capture with color coding (yellow=input, red=errors, gray=output)
- Expression results show repr() automatically
- Command history navigation with up/down arrows
- Word wrapping for long output lines
- Auto-scroll that doesn't fight manual scrolling
- mcrfpy.setDevConsole(bool) API to disable for shipping

Technical changes:
- Update imgui submodule to v1.89.9 (stable)
- Update imgui-sfml submodule to 2.6.x branch (SFML 2.x compatible)
- Add ImGui sources to CMakeLists.txt with OpenGL dependency
- Integrate ImGui lifecycle into GameEngine
- Add ImGuiConsole class for console overlay

closes #36, closes #65, closes #75

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>
This commit is contained in:
John McCardle 2025-11-26 20:03:58 -05:00
commit 3f6ea4fe33
9 changed files with 405 additions and 10 deletions
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Subproject commit 313676d200f093e2694b5cfca574f72a2b116c85
Subproject commit c6e0284ac58b3f205c95365478888f7b53b077e2

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Subproject commit de565ac8f2b795dedc0307b60830cb006afd2ecd
Subproject commit bf9023d1bc6ec422769559a5eff60bd00597354f