Adds `offset` query param (default 0) and `total_matching` + `offset`
response fields. Backend already computes the full sorted list of
above-threshold matches per query; pagination just slices it at
[offset, offset+limit) instead of always returning the top window.
Offsets past the end return an empty page cleanly so the client can
stop fetching naturally.
Re-scores on every page rather than caching the sorted list — at
personal-library scale (~14k embeddings, 768d) the dot-product loop
is sub-100ms and the lack of state means no eviction / staleness
concerns.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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