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- Pure Python 3 compiler for v2 timeline syntax
- DAG validation: cycle detection, connectivity, node inference
- Topological sort (Kahn's algorithm)
- Lifetime analysis for optimization
- Ping-pong detection framework (needs refinement)
- Multi-input/multi-output effect routing
- Generates optimized C++ SequenceV2 subclasses
Validated on:
- Simple linear chain (source->temp->sink)
- Complex DAG (deferred render + compose + post)
- Generates correct execution order
Phase 2 complete. Next: Phase 3 effect migration
handoff(Claude): Phase 2 complete, compiler generates valid C++
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