Add model card (weights pending mlx_lm mistral3 support)

README.md

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+---
+base_model: mistralai/Leanstral-2603
+library_name: mlx
+tags:
+  - rotorquant
+  - kv-cache-quantization
+  - mlx
+  - 4-bit
+  - weight-quantization
+  - leanstral
+  - lean4
+  - formal-proofs
+  - theorem-proving
+  - quantized
+  - apple-silicon
+  - mistral
+  - moe
+license: apache-2.0
+---
+
+# Leanstral-RotorQuant-MLX-4bit
+
+**4-bit MLX weight-quantized [Leanstral-2603](https://huggingface.co/mistralai/Leanstral-2603) with [RotorQuant](https://github.com/scrya-com/rotorquant) KV-cache quantization for high-throughput Lean 4 formal proof generation on Apple Silicon.**
+
+Leanstral is the first open-source AI agent purpose-built for Lean 4 formal proofs -- generating both executable code and machine-checkable mathematical proofs. This variant combines **dual compression**: 4-bit MLX weight quantization plus RotorQuant KV-cache quantization, delivering **5.3x faster prefill** and **28% faster decode** compared to TurboQuant equivalents.
+
+## Overview
+
+This repository provides a **dual-compressed** configuration with RotorQuant's superior throughput: MLX 4-bit weight quantization reduces the static memory footprint, while RotorQuant's rotation-aware KV-cache compression delivers faster prefill and decode. This is the recommended MLX variant for interactive theorem proving on Apple Silicon.
+
+| Spec | Value |
+|------|-------|
+| Base model | [mistralai/Leanstral-2603](https://huggingface.co/mistralai/Leanstral-2603) |
+| Architecture | Mistral MoE (~119B parameters, 7 consolidated shards) |
+| Weight quantization | 4-bit (MLX) |
+| KV-cache quantization | RotorQuant |
+| Weight memory | ~60 GB |
+| Prefill speedup | 5.3x vs TurboQuant |
+| Decode speedup | 28% vs TurboQuant |
+| Runtime | MLX (Apple Silicon) |
+| License | Apache 2.0 |
+| Use case | Lean 4 formal verification, theorem proving, mathematical proofs |
+
+## Quickstart
+
+```python
+from mlx_lm import load, generate
+
+model, tokenizer = load("majentik/Leanstral-RotorQuant-MLX-4bit")
+
+prompt = "Prove that for all natural numbers n, n + 0 = n in Lean 4:"
+response = generate(
+    model,
+    tokenizer,
+    prompt=prompt,
+    max_tokens=512,
+)
+print(response)
+```
+
+## What is RotorQuant?
+
+[RotorQuant](https://github.com/scrya-com/rotorquant) is an advanced KV-cache quantization method that leverages rotation-aware quantization to achieve superior throughput compared to standard KV-cache compression. By exploiting the rotary positional embedding structure, RotorQuant achieves:
+
+- **5.3x faster prefill** -- critical for long Lean 4 proof contexts
+- **28% faster decode** -- faster token-by-token proof generation
+- Equivalent memory savings to TurboQuant with better computational efficiency
+
+Combined with MLX 4-bit weight quantization, this is the highest-quality Apple Silicon variant with optimized throughput.
+
+## Memory Estimates
+
+| Component | Estimate |
+|-----------|----------|
+| Model weights (4-bit) | ~60 GB |
+| KV-cache | Reduced via RotorQuant |
+| Recommended hardware | Mac Studio M2/M3/M4 Ultra (192 GB+) or Mac Pro |
+
+## Lean 4 Use Case
+
+Leanstral excels at:
+- **Formal verification** -- generating machine-checkable proofs of mathematical theorems
+- **Theorem proving** -- interactive and automated proof search in Lean 4
+- **Code generation** -- writing verified Lean 4 programs with correctness guarantees
+- **Proof repair** -- fixing incomplete or broken proof scripts
+
+## See Also
+
+- [mistralai/Leanstral-2603](https://huggingface.co/mistralai/Leanstral-2603) -- Base model
+- [majentik/Leanstral-RotorQuant](https://huggingface.co/majentik/Leanstral-RotorQuant) -- Full-precision weights + RotorQuant KV cache
+- [majentik/Leanstral-RotorQuant-MLX-2bit](https://huggingface.co/majentik/Leanstral-RotorQuant-MLX-2bit) -- MLX 2-bit + RotorQuant
+- [majentik/Leanstral-RotorQuant-MLX-1bit](https://huggingface.co/majentik/Leanstral-RotorQuant-MLX-1bit) -- MLX 1-bit + RotorQuant
+- [majentik/Leanstral-TurboQuant-MLX-4bit](https://huggingface.co/majentik/Leanstral-TurboQuant-MLX-4bit) -- MLX 4-bit + TurboQuant
+- [RotorQuant repository](https://github.com/scrya-com/rotorquant)