Config

The current typed config surface is split between:

• graphids.exp.config for run and experiment configs plus typed stage payloads (FitRunPayload, CacheRunPayload, ExtractRunPayload, AnalyzeRunPayload)
• graphids.primitives for data, model, loss, scaler, representation, and discovery primitives

The older plan-chassis documentation is kept as historical reference in docs/reference/orchestration.md.