First implementation (#1)

Reviewed-on: #1

fixtures/records/anchor-cell.json

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+{"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"}