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

openkknd2-am-coder/docs/BUILD.md

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+# Build openkknd2
+
+```bash
+cd ~/src/openkknd2-am-coder
+./scripts/ci-headless.sh
+# or:
+cmake -S . -B build && cmake --build build
+./build/openkknd2 --headless --smoke
+```
+
+Deps: CMake, C compiler. SDL2 optional (not required for headless sim).

openkknd2-am-coder/docs/LORE.md

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+# Lore (original)
+
+Working names (change freely; **do not** use commercial KKnD faction trademarks as official names):
+
+- Faction A: **Ashcoat Compact** (scrap tech, discipline)
+- Faction B: **Bloomed** (mutated ecology, swarm tactics)
+
+Tone: dry wasteland humor, not a copy of any commercial script.