[claude] Document and validate AirLLM Apple Silicon requirements (#1284) (#1298)

README.md

@@ -9,6 +9,21 @@ API access with Bitcoin Lightning — all from a browser, no cloud AI required.
 
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+## System Requirements
+
+| Path | Hardware | RAM | Disk |
+|------|----------|-----|------|
+| **Ollama** (default) | Any OS — x86-64 or ARM | 8 GB min | 5–10 GB (model files) |
+| **AirLLM** (Apple Silicon) | M1, M2, M3, or M4 Mac | 16 GB min (32 GB recommended) | ~15 GB free |
+
+**Ollama path** runs on any modern machine — macOS, Linux, or Windows.  No GPU required.
+
+**AirLLM path** uses layer-by-layer loading for 70B+ models without a GPU.  Requires Apple
+Silicon and the `bigbrain` extras (`pip install ".[bigbrain]"`).  On Intel Mac or Linux the
+app automatically falls back to Ollama — no crash, no config change needed.
+
+---
+
 ## Quick Start
 
 ```bash