First implementation (#1)

Reviewed-on: #1

fixtures/records/submissions/anchor-hit.json

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+{"answers":{"anchors":[{"context":{"column_path":["Set A","$K_r$ (kcal mol⁻¹ Å⁻²)"],"row_path":["Bond parameters","CT–CT"],"table_label":"Table 1"},"doc":"hale2026harmonic-damb","format":"scienting-anchor/1","kind":"cell","node":"c20cna6","node_hash":"c8e6a553f5ae1377776e86dde6ee7d48a923dea7de417408841ea33b81563272","own_hash":"45bf6ab427d435f28b82cb2b64d93c502968921507fc9397abd5d5170731c6ab","quote":{"exact":"310.0"},"rev":12,"store":"smithlab"}]},"doc":"smithlab/hale2026harmonic-damb","exercise":"tag:scient.ing,2026:annotation:smithlab/whcypxav2cqbx","format":"scienting-submission/1","id":"kpjevbt3j6s3w","rev":12,"student":"s-7k2m","submitted_at":"2026-10-20T10:00:00Z"}

fixtures/records/submissions/anchor-miss.json

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+{"answers":{"anchors":[{"context":{"column_path":["Set B","$K_r$ (kcal mol⁻¹ Å⁻²)"],"row_path":["Bond parameters","CT–CT"],"table_label":"Table 1"},"doc":"hale2026harmonic-damb","format":"scienting-anchor/1","kind":"cell","node":"j6y45v6","node_hash":"00c4b92e220303ebc2bfb36aa557ac80ae4dba1675e9ed47adb82f6aeff10634","own_hash":"111d2b2cb30e3b04aff04b7de13a105a07a189d5ba97ae7d78eb7601ac99f9d9","quote":{"exact":"305.2"},"rev":12,"store":"smithlab"}]},"doc":"smithlab/hale2026harmonic-damb","exercise":"tag:scient.ing,2026:annotation:smithlab/whcypxav2cqbx","format":"scienting-submission/1","id":"ysw9hjztre498","rev":12,"student":"s-9q4p","submitted_at":"2026-10-20T10:00:00Z"}

fixtures/records/submissions/check-overlap.json

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+{"answers":{"anchors":[{"doc":"hale2026harmonic-damb","format":"scienting-anchor/1","kind":"sentence","node":"kea5026","node_hash":"b836d5872ca37471fa996be04c538254a8b1e37ca12e8f1b4a40837b503afa33","own_hash":"d673d236c03d9583ecf6e01fa819765ec324dc684bd9bbc6967fa50f216e34d2","quote":{"exact":"most common description of covalent","prefix":"Harmonic bond terms remain the ","suffix":" stretching in classical force f"},"rev":12,"span":[31,66],"store":"smithlab"}],"verdict":"supports"},"doc":"smithlab/hale2026harmonic-damb","exercise":"tag:scient.ing,2026:annotation:smithlab/y7bd3he0jwjbx","format":"scienting-submission/1","id":"n7me2fmcw8ree","rev":12,"student":"s-7k2m","submitted_at":"2026-10-20T10:05:00Z"}