Add ContractVariable structure and ContractVariableType enum

  - Define ContractVariableType enum with four types: eq_term, discovered_term, external_term, internal_citation
  - Add ContractVariable structure with fields for contract term analysis including name, type, id, value, level, confidence, position, context, variations, and citations
  - Expose both types through ExposedTypes for TypeScript generation

Author: TyVanRoy

model/equaliq.smithy

@@ -36,6 +36,8 @@ service EqualIQ {
 // When changing APIs, we sometimes want to expose unified types that aren't directly tied to any API.
 structure ExposedTypes { 
   QASectionsList: QASectionsList
+  ContractVariable: ContractVariable
+  ContractVariableType: ContractVariableType
 }
 
 // This API is used simply to expose types
@@ -102,6 +104,13 @@ enum SignContractResult {
     FAILURE
 }
 
+enum ContractVariableType {
+    EQ_TERM = "eq_term"
+    DISCOVERED_TERM = "discovered_term"
+    EXTERNAL_TERM = "external_term"
+    INTERNAL_CITATION = "internal_citation"
+}
+
 // Contract operations
 @http(method: "POST", uri: "/getContract")
 operation GetContract {
@@ -625,6 +634,41 @@ structure FixedTermValue {
     condition: String
 }
 
+// Contract variable structures
+
+structure ContractVariable {
+    @required
+    name: String
+
+    @required
+    type: ContractVariableType
+
+    // unique identifier for markup tags
+    id: String
+
+    // the definition/explanation for this variable
+    value: String
+
+    // 1-10 difficulty level (external terms only)
+    level: Integer
+
+    confidence: Float
+
+    // character position
+    firstOccurrence: Integer
+
+    // surrounding text
+    context: String
+
+    // alternative forms
+    variations: StringList
+
+    // for internal citations
+    referencedSection: String
+
+    // where the term is defined (e.g., "Section 7(ii)(c)(I)") - for EQ_TERM and DISCOVERED_TERM only
+    definitionCitation: String
+}
 
 // Common structures
 document Document