Use existing 'Primary Contact' relationship type via FORM_CONTACT_RELATIONSHIP constant

config/form.ts

@@ -537,6 +537,17 @@ export const ACTIVITY_TYPE_NAME = "Check-in (organizing)";
 /** Stage-snapshot field on the activity (so the form's stage_at_submission writes here). */
 export const ACTIVITY_STAGE_FIELD = `${G0}.Stage`;
 
+/**
+ * RelationshipType.name_a_b for the relationship that links the form-filler
+ * (Individual side) to the organization the form is about (Organization side).
+ *
+ * On `client.crm.fci.coop` we reuse the existing "Primary Contact"
+ * relationship type (id 24) rather than introducing a dedicated
+ * "Primary Form Contact" type. If you change this, also update the docs in
+ * the parent repo's spec.
+ */
+export const FORM_CONTACT_RELATIONSHIP = "Primary Contact";
+
 /** All distinct option_group_ids referenced by fields in this form. */
 export const optionGroupIds = Array.from(
   new Set(