~x-ai/grok-latest → B (1:8)

Side B fixes core canonical path/storage key inconsistencies (e.g. `https://slug.social/~` vs `~/` trailing-slash variants) that broke root child listings and sibling rankings, adding normalization helpers, call-site fixes, and multiple layers of unit/integration/browser tests. Side A only trims unused parameters and dead morph logic from a single JS helper—pure cleanup with no functional or lasting design impact.