init: OpenKKND scaffold and license

.gitignore

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+build/
+dist/
+logs/*.log
+.DS_Store
+*.o
+*.obj
+CMakeCache.txt
+CMakeFiles/

LICENSE

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+MIT License
+
+Copyright (c) 2026 OpenKKND contributors
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# OpenKKND
+
+Original post-apocalyptic **RTS** in portable **C11**.
+
+**Not** a remake of any commercial KKnD title. Genre-inspired only.
+No proprietary assets. Free/permissive third-party material only (see `THIRD_PARTY.md`).
+
+## Build (macOS / Linux / *BSD)
+
+```bash
+cmake -S . -B build -DCMAKE_BUILD_TYPE=Release
+cmake --build build -j
+./build/openkknd
+```
+
+Dependencies: **CMake ≥ 3.16**, **SDL2** (Homebrew `sdl2` / distro packages).
+
+## Packaging
+
+See `packaging/` for pkgsrc, FreeBSD/OpenBSD/DragonFly ports stubs,
+Windows MSI notes, and Linux static build notes.
+
+## Auto-build (every 4 hours)
+
+User LaunchAgent: `~/Library/LaunchAgents/ch.openkknd.autobuild.plist`  
+Script: `scripts/bump-and-build.sh` → artifacts in `dist/<version>/`.

THIRD_PARTY.md

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+# Third-party
+
+| Component | License | Source / note |
+|-----------|---------|----------------|
+| SDL2 | zlib | system / Homebrew / ports |
+| Placeholder graphics | generated in-engine | solid colors / rects — no external sprites yet |
+| Optional future packs | CC0 / CC-BY | e.g. Kenney.nl, OpenGameArt (attribute when added) |
+
+## Forbidden
+
+KKnD / Westwood / EA game data, ISOs, ripped sprites, music, maps, or reverse-engineered proprietary assets.

VERSION

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+0.1.0