system_for_each must be able to accept Entity as a component

[JohanNorberg]

No description provided.

[Copilot]

Pull request overview

This PR adds support for accepting Entity as a component parameter in system_for_each macro-generated functions, enabling systems to access entity identifiers during iteration. This aligns the macro with the existing ECS query system where Entity is already treated as a special queryable component type.

Key changes:

• Extended the system_for_each macro to recognize Entity as a valid component type
• Added comprehensive integration tests demonstrating entity-based filtering and destruction patterns

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
zero_ecs_macros/src/system_for_each_impl.rs	Adds "Entity" to the set of recognized component types for system parameter validation
zero_ecs_testbed/src/integration_tests/test_simple.rs	Adds test demonstrating Entity parameter usage for selective entity destruction based on component values

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