David Gwilliam c790027ede feat(graph): Add core graph abstraction for pipeline configuration ...

Introduce Node, Connection, and Graph classes for defining pipelines
as graphs instead of verbose XYZStage naming convention.

- Add NodeType enum (SOURCE, CAMERA, EFFECT, DISPLAY, etc.)
- Add Node, Connection, and Graph dataclasses with type hints
- Add validation for cycles and disconnected nodes using DFS
- Add factory methods: node(), connect(), chain() for easy graph building
- Support for both imperative and declarative graph construction

This provides the foundation for the graph-based DSL that replaces
the verbose XYZStage naming convention with intuitive node-and-connection syntax.

2026-03-21 19:26:27 -07:00

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