test: add live Binance performance baseline

[jackhai9]

Summary

• add a strict schema and CLI for live Binance timing captures and baseline comparisons
• require auditable test-order ledgers and reject malformed or incomplete baselines
• check in the first three-sample no-order performance capture and baseline

Validation

• npm test (311/311)
• npm run test:ui (45/45)
• npm run summarize:binance-orderbook-live -- e2e/binance-orderbook/live-baselines/no-orders-2026-08-26.capture.json --compare e2e/binance-orderbook/live-baselines/no-orders.baseline.json --enforce
• git diff --check
• read-only independent review: no P1/P2 findings