- Split single p-queue (5 req/s) into 3 isolated queues: operations (5/s), instruments (20/s), users (5/s) - Removed dead instruments param from mapBrokerPortfolio - portfolio/positions endpoints share raw GetPortfolio cache - Docs: T_BANK_INSTRUMENTS_RATE_LIMIT, CACHE_TBANK_POSITIONS_TTL, rate limiting section in tbank-invest.md