Reorder did DELETE all pool memberships then re-inserted only the passed
file_ids, so a paginated client that sent just the loaded pages silently
removed every other file from the pool. Reorder now places the requested
files in order and appends any members the request omitted (in their
current order), so a partial reorder is safe and correct.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Add pool repo (gap-based position ordering, cursor pagination, add/remove/reorder
files), service, handler, and wire all /pools endpoints including
/pools/:id/files, /pools/:id/files/remove, and /pools/:id/files/reorder.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
H1K0