~anthropic/claude-sonnet-latest → B (80:20)

Side B makes several substantive fixes: correcting attribution by passing delegate_opt out-of-band, fixing a real bug where sibling pool fallback silently expanded to all items instead of erroring, removing dead UI, and consistently renaming a route across code and tests. Side A is a small, purely cosmetic CSS/layout fix moving a view counter into the nav, useful but minor in scope and impact.