kitchen: README + MISSIONS/engine-c keep-drop notes

MISSIONS/qwen.MISSION.md

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+# KKND2 Auftrag — openkknd-qwen (qwen2.5-coder)
+
+You own this tree: `/home/vx/src/openkknd-qwen`
+
+## Goal
+Continue / improve **openkknd** — a Krush Kill 'n' Destroy–style **2D RTS** in **C11 + SDL2** (+ SDL2_ttf, zlib).
+
+Reference (read-only if needed): `/home/vx/openkknd` — do **not** modify it. Work only here.
+
+## Required outcomes
+1. Project builds with `./build.sh` (or fix Makefile/build.sh until it does).
+2. Keep modular layout: `src/*.c`, `include/*.h`, `assets/` as needed.
+3. Game loop + map/units/buildings should remain coherent; fix compile errors first.
+4. Add a short `README.md` describing how to build and run.
+5. `git init` if missing; commit meaningful steps when something works.
+6. Prefer real shell tools (`exec`) over inventing files without writing them.
+
+## Constraints
+- Host: Linux (CachyOS), user `vx`, packages: gcc, sdl2, SDL2_ttf.
+- No network installs that need root/sudo.
+- Stay inside this directory.
+
+## First steps
+1. `cd /home/vx/src/openkknd-qwen && ls -la`
+2. Try `./build.sh` and fix failures.
+3. Improve gameplay or structure only after a green build.