docs(language-packs): document relational predicate proposal

language_packs/data/en_core_relational_predicates_v1/README.md

@@ -0,0 +1,48 @@
+# en_core_relational_predicates_v1
+
+Proposal-only curated English relational-predicate pack for finite-entity grounding.
+
+This pack is intentionally compact. It is not a bulk corpus and is not mounted by
+default. It contributes binary predicate surfaces only, leaving existing noun,
+adverb, and adposition packs untouched.
+
+## Scope
+
+- Kinship predicates: `parent_of`, `child_of`, `sibling_of`, `spouse_of`
+- Ordering/comparison predicates: `less_than`, `greater_than`, `equal_to`, `distinct_from`
+- Spatial predicates: `left_of`, `right_of`, `inside_of`, `adjacent_to`
+- Temporal predicates: `before_event`, `after_event`, `during_event`, `overlaps_event`
+
+## Curation rules
+
+- Deterministic lexical order: kinship, ordering/comparison, spatial, temporal.
+- One row per lemma.
+- Every lemma spans at least two semantic domains through `semantic_domains`.
+- Surfaces are predicate-shaped to avoid collisions with prior mounted lexical
+  surfaces such as `parent`, `child`, `left`, `before`, and `after`.
+- `gate_engaged` is `false`; this remains pending review and runtime admission.
+
+## Collision audit
+
+Audited candidate lemmas against the explicitly requested packs:
+
+- `en_core_relations_v1`
+- `en_core_cognition_v1`
+
+Additional adjacent mounted/content packs checked while drafting:
+
+- `en_core_relations_v2`
+- `en_core_spatial_v1`
+- `en_core_temporal_v1`
+
+No proposed lemma duplicates a reviewed lemma observed in those packs. The pack
+therefore avoids the reverted-pack failure mode where natural-language lemmas
+collided with existing mounted entries.
+
+## Checksum
+
+`lexicon.jsonl` SHA-256:
+
+```text
+5f3615c69e583b9e1891afd73b90786e5ec563400b24706dbbccb1b4dccef63a
+```