studio-manager now accepts an optional path argument:
dmf-studio-manager graph.json
load_graph() parses nodes and edges from JSON, generating fresh UUIDs
for each MXL flow on every launch. Falls back to hardcoded build_graph()
when no argument is given.
graph.json at repo root defines the current testpattern→ndiout pipeline.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>