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Compile-time tag types for engine role classification. More...

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 # helios::engine::common::tags
 
 Compile-time tag types for engine role classification.
 
 ## Overview
 
 Tag types are empty structs used as compile-time markers. A class declares
 its engine role by adding a nested type alias:
 
 ```cpp
 using EngineRoleTag = helios::engine::common::tags::SystemRole;
 ```
 
 The [concepts](../concepts/README.md) module detects this alias via `HasTag`
 and uses it to gate registration APIs, preventing accidental registration of
 types that happen to have matching method signatures.
 
 ## Tags
 
 | Tag | Role | Detected by |
 |-----|------|-------------|
 | `ManagerRole` | Batch-processing manager | `IsManagerLike<T>` |
 | `SystemRole` | Per-frame game logic processor | `IsSystemLike<T>` |
 
 ## Usage
 
 ```cpp
 class MySystem {
 public:
  using EngineRoleTag = helios::engine::common::tags::SystemRole;
 
  void update(UpdateContext& ctx) noexcept {
  // per-frame logic
  }
 };
 ```
 
 ## See Also
 
 - [Concepts](../concepts/README.md) — Role concepts consuming these tags
 - [System](../../../../docs/core-concepts/ecs/system.md) — System architecture
 - [Command System](../../../../docs/core-concepts/command-system.md) — Manager registration
 
 ---
 <details>
 <summary>Doxygen</summary><p>
 @namespace helios::engine::common::tags
 @brief Compile-time tag types for engine role classification.
 </p></details>
 

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