docs: prepend REQUIRED warning — jangtq_runtime.safetensors sidecar must be downloaded

README.md

@@ -19,21 +19,29 @@ tags:
 - jangtq2
 - reap
 ---
-> ## ⚠️ IMPORTANT — Re-download required if you pulled before 2026-04-25
+> ## ⚠️ REQUIRED — `jangtq_runtime.safetensors` sidecar must be downloaded
 >
-> This bundle was published in two commits: the initial commit had only the
-> quantized weight shards, and the codebook + Hadamard-rotation sidecar
-> (`jangtq_runtime.safetensors`) was uploaded ~2.1h later.
->
-> **OsaurusAI bundles are loaded by the Osaurus Swift app via the native
-> JANGTQ runtime — `jangtq_runtime.safetensors` is required.** Without it,
-> the loader cannot reconstruct the codebook used during quantization and
-> output is incoherent.
+> Osaurus uses the native Swift JANGTQ runtime. **Every JANGTQ bundle on
+> OsaurusAI ships a small `jangtq_runtime.safetensors` sidecar (~10 KB–~165 KB)
+> alongside the weight shards.** The Swift loader will refuse to start with
+> the error
+> ```
+> Error: Model '<name>' declares JANGTQ (weight_format: "mxtq") but is
+>        missing required sidecar file 'jangtq_runtime.safetensors'.
+>        Re-download the full model or obtain the sidecar from the original
+>        publisher.
+> ```
+> if the file is absent.
 >
-> **Action:** re-pull the bundle (or just download the single file):
+> If your local copy doesn't have it (older download, partial sync, etc):
 > ```bash
 > hf download OsaurusAI/MiniMax-M2.7-Small-JANGTQ jangtq_runtime.safetensors --local-dir <your-dir>
 > ```
+> The file holds the deterministic codebooks + Hadamard rotation signs the
+> Swift loader uses to decode `*.tq_packed` weights. It must match the seed
+> the bundle was quantized with (`mxtq_seed=42`).
+
+