v0.0.1

Added

• Initial pre-release: C++ client library for the Alpaca Trading API
  • Market Data API
• Modular libraries: alpaca_markets_models, alpaca_markets_rest,
  alpaca_markets_stream (stream is placeholder)
• 40+ REST endpoints across Trading API v2 and Market Data API v2
• Comprehensive data models (94 unit tests): Account, Order, Position,
  Asset, Bars, Quotes, Options, Corporate Actions, News, Crypto
• Smart diff-aware Makefile (tracks git HEAD, rebuilds only changed
  modules)
• Three integration modes documented: FetchContent, find_package,
  git submodule
• Paper / live env handling via APCA_API_KEY_ID /
  ALPACA_MARKETS_KEY_ID env vars
• Header-only RapidJSON + cpp-httplib via FetchContent (system
  fallback via USE_SYSTEM_* options)
• C++20 (pragmatic; avoids C++23 compiler fragmentation that the
  sibling SDKs require)

Placeholder

• WebSocket streaming module exists as scaffolding but no
  implementation yet