~anthropic/claude-sonnet-latest → A (8:2)

Side A is a substantial, coherent refactor that introduces a shared room-route encoding module, fixes real URL-consistency bugs, and adds meaningful new normalization logic (YouTube URL canonicalization, query sorting) with extensive new tests, touching many call sites consistently. Side B is a small, correct bugfix (moving a zero-ratio guard earlier to avoid ghost items) which is valuable but narrow in scope and lasting impact compared to A's broader architectural improvement.