Keep max_new_tokens: 440 on Transformers.js 4.3.2 and pin the seek-loop condition it avoids

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

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

@@ -82,16 +82,16 @@ onnxruntime-node 1.30.0), bun:test.
 **Files:** Modify `tests/transformers-runtime.test.ts`, `docs/Decisions.md`,
 `src/worker/inference.worker.ts` (comment only: "4.2" → "4.2–4.3", cite D-WS1b).
 
-- [ ] **Step 1: Test** `"Whisper generate still takes the seek loop when max_new_tokens is unset (D-021)"`
+- [x] **Step 1: Test** `"Whisper generate still takes the seek loop when max_new_tokens is unset (D-021)"`
   — `src/models/whisper/modeling_whisper.js` contains
   `if (generation_config.return_timestamps && !kwargs.max_new_tokens)`. Run → PASS expected
   (tripwire; it encodes the revisit condition, verified against the 4.3.2 source).
-- [ ] **Step 2: Measure** (`/tmp/ws1/d021.ts`, onnxruntime-node, under the lock): tiny.en q8 on
+- [x] **Step 2: Measure** (`/tmp/ws1/d021.ts`, onnxruntime-node, under the lock): tiny.en q8 on
   `en_alien.opus` (ffmpeg-static → 16 kHz f32), pipeline options as the worker
   (`chunk_length_s 30, stride_length_s 5, return_timestamps true`), with and without
   `max_new_tokens: 440`; record wall-clock, generate-pass count (wrap `model.generate`), window
   count, WER vs `en_alien.txt` (`tests/dsp.ts` `wordErrorRate`).
-- [ ] **Step 3:** `D-WS1b` with the numbers; keep `max_new_tokens: 440` unless the seek path is now
+- [x] **Step 3:** `D-WS1b` with the numbers; keep `max_new_tokens: 440` unless the seek path is now
   both faster and not worse on WER. Commit.
 
 ### Task 3: D-014 re-test (WASM graphOptimizationLevel)