Add E2E Structures tab

Fix Baseline A/B/C sidebar rendering; rename to 'structure per q' / 'structure per ds' / 'DCI'; add e2e as 7th config in Compare

Add 4 MoNaCo-parity tabs: Unified eval, Eval Structures v0, Baseline A/B/C trajectories, Compare

Add E2E Trajectories view: agent traj + per-qid F1/EM for wiki_opentable e2e run

Initial: Open-WikiTable test split viewer (6,602 qids)