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+## Chelsea's MC Worldgen
+
+Chelsea's take on Minecraft terrain lives here: a fast C port of my original Python generator with multithreaded chunk workers, Simplex noise, and just enough chaos to keep it interesting. Consider it about **3/4 vibecoded**—the math is solid, but a quarter of the surface area is vibes, instinct, and late-night tuning.
+
+### What it does
+
+- Generates chunk data compatible with vanilla region (`.mca`) files or raw binary dumps.
+- Keeps the original Python ordering for noise, terrain, ores, and tree placement so worlds feel familiar.
+- Splits work efficiently across threads so you can saturate multi-core machines or scatter jobs in a cluster.
+
+### Build it
+
+```sh
+make
+```
+
+This drops the `worldgen` binary into `bin/`.
+
+### Run it
+
+```sh
+./bin/worldgen --radius 2 --threads 8 --out output
+```
+
+Key flags:
+
+- `--radius R` with optional `--center-x`/`--center-z` for quick square patches.
+- `--min-x`, `--max-x`, `--min-z`, `--max-z` for explicit rectangles (great for splitting work across machines).
+- `--threads N` to match your CPU.
+- `--seed S`, `--sea-level L`, and `--format mca|bin` for the usual customization knobs.
+
+`mca` (default) writes region files you can copy directly into a world directory under `region/`. `bin` preserves the older chunk-dump pipeline for custom tooling.
+
+### Output anatomy
+
+Each chunk blob contains:
+
+1. `int32 chunk_x`, `int32 chunk_z`
+2. `uint16 heightmap[16][16]`
+3. `uint16 blocks[256][16][16]`
+
+Chunks are independent, so spray out ranges across machines and merge by simply putting the files in the same output directory.
+
+### State of the vibes
+
+- Noise scaffolding is done.
+- Decoration passes (ores, trees) mirror the Python original.
+- Region writer is battle-tested, but I still keep eyes on biome edges.
+- Feature ideas welcome—PRs, issues, or just DM me about the remaining 1/4 vibe debt.