Diwak4r3/9/2026, 5:43:22 PM

This commit corrects several issues identified in the PR feedback:\n - Updates WEBSOCKET_PROTOCOL_VERSION to 7.3 to match documentation.\n - Adds session_usage event to protocolEventParser schema and known types.\n - Clarifies prefix matching documentation in pricing.ts.\n - Fixes formatCost implementation/documentation mismatch.\n - Includes missing byModel and turns fields in SessionUsageSnapshot documentation.

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