Build the full Experiment Builder (ExperimentPage.tsx) with: basic info form,
sample data input (text/JSON/file upload), pipeline stage builder with template
variables and preview, scoring configuration with enable toggles and weight
sliders, parameter space definition (fixed/range/options types), and action
buttons (Save Draft, Run Single, Start Sweep). Supports both creating new
experiments and editing existing ones. 20 tests added.
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