Two freeze modes for capturing and preserving musical state:
- Algorithm freeze: snapshot all primitive params + seeds. Individual
params can be selectively unfrozen for ML-driven exploration via
DeltaController (applies MLP deltas to frozen base values with
per-param boundary enforcement).
- Pattern freeze: snapshot the realized note pattern. The sequencer
bypasses the primitive chain entirely and loops the frozen pattern.
Extracts _runPipeline() from setSequenceInputs() for reuse.
