v0.8.0

Added

• New companies() SDK method for symbol discovery via GET /companies/ with search, market, limit, and offset
• README discovery-first examples for search, market filter, and pagination
• Integration coverage for live company-directory response shape

Changed

• Market normalization for company discovery supports TASI/NOMU with NOMUC -> NOMU
• API reference now includes GET /companies/

Fixed

• Client-side validation enforces limit > 0 and offset >= 0