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holo-load2bit.mjs

@@ -10,7 +10,7 @@
 // SAME { manifest, fetchTensor } shape — so the engine, KV-cache, and Q's brain loader need no changes.
 import { f16ToF32 } from "./qvac-ingest.mjs";
 import { blake3hex } from "./holo-blake3.mjs";   // BLAKE3 σ-axis κ verify (opt-in via manifest.hash==="blake3") — the GPU-parallel tree hash
-import { gpuBlake3Hex } from "./gpu-blake3.mjs"; // the SAME BLAKE3, run entirely on the GPU (2.74 GB/s) — used when globalThis.__gpuVerify
+import { gpuBlake3Hex, gpuBlake3Available } from "./gpu-blake3.mjs"; // the SAME BLAKE3, run entirely on the GPU (2.74 GB/s)
 
 async function gunzip(u8) { const ds = new DecompressionStream("gzip"); const w = ds.writable.getWriter(); w.write(u8); w.close(); return new Uint8Array(await new Response(ds.readable).arrayBuffer()); }
 const hex = (buf) => [...new Uint8Array(buf)].map((b) => b.toString(16).padStart(2, "0")).join("");
@@ -110,9 +110,11 @@ export async function loadKappaObject(baseUrl, opts = {}) {
     // hash the on-GPU verifier reproduces; else SHA-256 (SRI axis, default). Untrusted-CDN-safe either way.
     let got;
     if (man.hash === "blake3") {
-      if (typeof globalThis !== "undefined" && globalThis.__gpuVerify) {
-        try { got = "blake3:" + await gpuBlake3Hex(gz); }              // re-derive on the GPU (no CPU hash on the hot path)
-        catch (e) { got = "blake3:" + blake3hex(gz); }                 // fall back to CPU if WebGPU verify is unavailable
+      // DEFAULT: re-derive on the GPU (2.74 GB/s, no CPU hash on the hot path) whenever WebGPU is present;
+      // set globalThis.__gpuVerify=false to force the CPU path. CPU BLAKE3 is the automatic fallback.
+      if (gpuBlake3Available() && (typeof globalThis === "undefined" || globalThis.__gpuVerify !== false)) {
+        try { got = "blake3:" + await gpuBlake3Hex(gz); }
+        catch (e) { got = "blake3:" + blake3hex(gz); }
       } else got = "blake3:" + blake3hex(gz);
     } else got = "sha256:" + hex(await crypto.subtle.digest("SHA-256", gz));
     if (got !== kappa) throw new Error("κ MISMATCH " + kappa.slice(0, 24));