ibcore 0.2.1

Standalone IB Gateway integration layer wrapping ibapi — diagnostic events, structured errors, market data snapshots
Documentation 
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# ibcore — Rust IB Gateway Integration

## Tech Stack
- Rust (edition 2024)
- `ibapi` crate v3.0 for Interactive Brokers Gateway
- Tokio async runtime

## Commands
- Compile: `cargo check`
- Full build: `cargo build`
- Unit tests: `cargo test --lib`
- Clippy lint: `cargo clippy -- -D warnings`
- Build with Python feature: `cargo build --features python`
- Python build: `cd python && maturin develop --release`

## Testing

### Unit Tests
```bash
cargo test --lib
```
131 tests covering: client, snapshots, diagnostics, errors, orders, streaming, historical, chain, contract, exchange.

### Python Tests
```bash
cd python && pytest tests/
```

## Conventions
- TDD: write failing test → minimum code → refactor
- All IB calls async via Tokio
- PyO3 bindings behind `#[cfg(feature = "python")]` gate
- No hardcoded secrets