kidlisp(datomic): fetch full corpus when handle filter is present
/api/store-kidlisp?recent=true&handle=@jeffrey was pulling the
sidecar's top 2000 by created-at, then filtering to the handle in JS —
so any @jeffrey pieces older than position 2000 (e.g. 2025-08 \$air,
\$bip, \$faim) were silently dropped before the handle match ran.
When handle is set, request the full corpus from the sidecar (100K
cap) and trim to the client's limit after filtering.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>