[Exchange] Add hypothesis comparison view with side-by-side scores and evidence

[Exchange] Add hypothesis comparison view with side-by-side scores and evidence

ID: e835bb37-416 Priority: 91 Type: one_shot Status: open

Goal

Quest 2/16: Add a comparison modal/page to the Exchange where users can select 2-3 hypotheses and see their scores, evidence, and pathway diagrams side-by-side. This is a key demo feature showing the market-style evaluation system.

Acceptance Criteria

Work Log