orion-ecs / keen-eye / 20007932680

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Implement system execution ordering with phases, priorities, and dependencies (Issue #73)

Features:
- Add SystemPhase enum with 6 execution phases (EarlyUpdate → PostRender)
- Add Order parameter for priority-based sorting within phases
- Add [RunBefore] and [RunAfter] attributes for dependency constraints
- Implement topological sorting with Kahn's algorithm for dependency resolution
- Add cycle detection with descriptive error messages
- Add World.FixedUpdate() method for fixed timestep updates
- Update SystemGenerator to extract and generate ordering metadata

Source Analyzer (KEEN diagnostics):
- KEEN001: Self-referential ordering constraint (Error)
- KEEN002: Target type must be a class (Error)
- KEEN003: Missing [System] attribute (Warning)
- KEEN004: Target should implement ISystem (Warning)

Comprehensive tests added for all features.

230 of 231 new or added lines in 3 files covered. (99.57%)

2252 of 2291 relevant lines covered (98.3%)

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