nx_term_cooccur.nx

nx_term_cooccur.nx -- pairwise term co-occurrence counts. Tracks how often every (term_a, term_b) pair appears together within the same beat (or, optionally, within the same scene). Foundation for arc-anchor discovery: the most-common (OUTFIT + LOCATION) pair in a corpus is a candidate "scene anchor" that the director-initiative layer can surface as a recurring motif. Per cardinals: feedback-self-surfacing-intelligence: Counts are LIVE measurements; STAGE2 promotion of a pair to an arc-anchor proposal happens at NX_COOCCUR_PROMOTE_N (5) joint sightings with 0 user dismissals. feedback-loras-and-negatives-are-patches: Pure integer counts; no opaque embedding distance. Auditable. feedback-user-owns-every-bit: Snapshots to nishi-library only via explicit caller request. Storage: bounded open-addressing hash table keyed by the canonical pair-key (term_a << 32 | term_b) with term_a < term_b enforced at insertion. Cap defaults to 65536 pairs; caller sizes via nx_cooccur_alloc_sized for larger corpora. nx_safety_envelope: intended_use: "Pairwise co-occurrence counts of registered terms within ingestion groupings (per-beat or per-scene)." sil_target: SIL2 asil_target: QM dal_target: DAL C iec_62304_class: NONE evidence: [no_floating_point, fixed_capacity_hash_table, bounded_probe_length_per_jpl_rule_2, canonical_pair_ordering_enforced, counts_are_monotonic_non_decreasing] hazard_register: [bug-tape-pair-key-hash-collision, bug-tape-overflow-returns-error, bug-tape-self-pair-silently-skipped] residual_risk: "Open-addressing probe limit caps recall on