PARRY latency spike — gate G1 (§9.1): can the Tactician tick inside the budget?

Measures the full prefill+decode op on a production-length prompt (plan-string included), grammar-constrained, end-to-end through the Web Worker. PASS on this machine: warm median ≤ 25ms · p95 ≤ 40ms · first-op-after-Analyst ≤ 60ms.