Run WASM sessions at the default graph optimization level now that ort-web 1.31 loads the 8-bit decoders

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docs/plans/001-1-transformers-upgrade.md

@@ -98,12 +98,12 @@ onnxruntime-node 1.30.0), bun:test.
 
 **Files:** `docs/Decisions.md`; `src/worker/inference.worker.ts` only if the outcome is "drop".
 
-- [ ] **Step 1: Measure** (`/tmp/ws1/d014.ts`): `globalThis[Symbol.for("onnxruntime")] =
+- [x] **Step 1: Measure** (`/tmp/ws1/d014.ts`): `globalThis[Symbol.for("onnxruntime")] =
   await import("onnxruntime-web")` before importing transformers, wasm EP, 1 thread; for
   `onnx-community/whisper-tiny` `decoder_model_merged_quantized.onnx` create a session at
   `disabled/basic/extended/all`; record success/error. If all load: transcribe `en_aiproblem` with
   tiny.en q8 at `basic` vs default (`all`), 3 warm runs each, wall-clock + text identity.
-- [ ] **Step 2:** If default fails → keep, `D-WS1c` "still needed on ort-web 1.31.0-dev". If it
+- [x] **Step 2:** If default fails → keep, `D-WS1c` "still needed on ort-web 1.31.0-dev". If it
   loads and is not slower → remove the override (worker comment cites D-WS1c), run a q8 transcribe
   again through the harness with the worker's new options. Commit.