UML Class Diagram

```mermaid %%{init: {"theme": "base"}}%% classDiagram classDef service fill:#113247,stroke:#f2c14e,color:#f8fbfd,stroke-width:2px; classDef core fill:#1d5c63,stroke:#a7d8c9,color:#f8fbfd,stroke-width:2px; classDef state fill:#f4efe6,stroke:#d17b49,color:#173042,stroke-width:2px;

class DataSource { +get_bars(symbol, range) +get_ticks(symbol, range) }

class EventLoop { +run() +on_event(cb) }

class Strategy { +on_bar(bar) +on_tick(tick) +on_regime(regime) }

class ExecutionPipeline { +on_order_submitted(order) }

class RiskManager { +validate(order, portfolio) }

class RegimeDetector { +update(features) +current_regime() }

class Portfolio { +apply_fill(fill) +equity() }

DataSource --> EventLoop EventLoop --> Strategy Strategy --> ExecutionPipeline ExecutionPipeline --> Portfolio Strategy --> RiskManager RegimeDetector --> Strategy RegimeDetector --> Portfolio

class DataSource service class EventLoop service class Strategy service class ExecutionPipeline core class RiskManager core class RegimeDetector core class Portfolio state ```