Add queryable capability contracts and checked GraphQL artifacts

grammar/QuixosCapability.g4

@@ -100,7 +100,7 @@ operationMember
   ;
 
 valueMember
-  : VALUE identifier ID stringLiteral COLON valueType
+  : queryReadContract? VALUE identifier ID stringLiteral COLON valueType
     LBRACE valueMemberOperation* RBRACE
   ;
 
@@ -111,10 +111,14 @@ valueMemberOperation
   ;
 
 relationshipMember
-  : RELATION identifier ID stringLiteral COLON cardinality targetConstraint ORDERED?
+  : queryReadContract? RELATION identifier ID stringLiteral COLON cardinality targetConstraint ORDERED?
     LBRACE relationshipOperation* RBRACE
   ;
 
+queryReadContract
+  : QUERYABLE RPC?
+  ;
+
 relationshipOperation
   : RESOLVE ID stringLiteral SEMI
   | CONNECT ID stringLiteral SEMI
@@ -138,6 +142,21 @@ packageExport
   : packageOperationExport
   | packageFunctionExport
   | packageConstructorExport
+  | packageQuery
+  ;
+
+packageQuery
+  : QUERY identifier ID stringLiteral ROOT interfaceType
+    DOCUMENT stringLiteral OPERATION stringLiteral LBRACE queryClause* RBRACE
+  ;
+
+queryClause
+  : FRAGMENTS stringLiteral SEMI
+  | VIEW identifier AS interfaceType SEMI
+  | MAX identifier INTEGER SEMI
+  | ALLOW interfaceType DOT identifier identifier stringLiteral SEMI
+  | WATCH SEMI
+  | POLL INTEGER stringLiteral SEMI
   ;
 
 packageOperationExport
@@ -252,7 +271,7 @@ relationshipMaterializationDecl
   ;
 
 operationBindingDecl
-  : BIND memberOperationRef TO operationProvider SEMI
+  : BIND memberOperationRef TO operationProvider (QUERY_REASON stringLiteral)? SEMI
   ;
 
 memberOperationRef
@@ -371,6 +390,16 @@ jsonArray
 identifier
   : IDENTIFIER
   | SOURCE
+  | QUERY
+  | ROOT
+  | DOCUMENT
+  | FRAGMENTS
+  | VIEW
+  | MAX
+  | ALLOW
+  | POLL
+  | RPC
+  | QUERYABLE
   ;
 
 stringLiteral
@@ -378,6 +407,17 @@ stringLiteral
   ;
 
 WORKSPACE: 'workspace';
+QUERY: 'query';
+ROOT: 'root';
+DOCUMENT: 'document';
+FRAGMENTS: 'fragments';
+VIEW: 'view';
+MAX: 'max';
+ALLOW: 'allow';
+POLL: 'poll';
+QUERYABLE: 'queryable';
+RPC: 'rpc';
+QUERY_REASON: 'query-reason';
 TYPE: 'type';
 OBJECT: 'object';
 STORABLE: 'storable';