Add rate limiter (50/s + 5/s historical), symbol mapper, order builders,
account queries, market data subscriptions, and high-level CTraderClient
that orchestrates the full connect/auth/symbol-load lifecycle.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
CTraderCodec implements tokio_util Decoder+Encoder with 4-byte BE length
prefix framing. Handles partial frames, multiple frames in buffer, and
rejects oversized frames (16 MiB max). 5 unit tests.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
New workspace crate for cTrader Open API client (Protobuf over TCP+TLS).
Includes CTraderConfig, CTraderEnvironment, CTraderError, and RateLimitBucket types.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>