sea-results: refresh test fakes for the merged-kernel binding surface

Rebased onto the updated sea-execution. Updates StatementStub to the
merged-kernel Statement surface (statementId + status accessors, sync
schema()) and casts useSEA in the relocated tests/e2e/sea/results-e2e
test. Pre-existing SeaOperationBackend neutral-type conformance remains a
sea-results follow-up.

Co-authored-by: Isaac

Author: msrathore-db

tests/e2e/sea/results-e2e.test.ts

@@ -16,6 +16,8 @@
 
 import { expect } from 'chai';
 import { DBSQLClient } from '../../../lib';
+import { ConnectionOptions } from '../../../lib/contracts/IDBSQLClient';
+import { InternalConnectionOptions } from '../../../lib/contracts/InternalConnectionOptions';
 
 // Integration suite: connect through both backends, run a probe query,
 // and assert byte-identical row output (the M0 parity gate). Requires
@@ -50,7 +52,7 @@ async function fetchProbeRows(useSEA: boolean, secrets: PecoSecrets): Promise<Ar
     path: secrets.path,
     token: secrets.token,
     useSEA,
-  });
+  } as ConnectionOptions & InternalConnectionOptions);
   try {
     const session = await client.openSession();
     try {

tests/unit/sea/SeaOperationBackend.test.ts

@@ -58,12 +58,16 @@ class StatementStub {
     this.batches = [...batches];
   }
 
+  // Mirrors the kernel `Statement.statementId` getter.
+  public readonly statementId = '01ef-fake-statement-id';
+
   public async fetchNextBatch(): Promise<{ ipcBytes: Buffer } | null> {
     if (this.batches.length === 0) return null;
     return { ipcBytes: this.batches.shift() as Buffer };
   }
 
-  public async schema(): Promise<{ ipcBytes: Buffer }> {
+  // schema() is synchronous on the merged-kernel binding.
+  public schema(): { ipcBytes: Buffer } {
     return { ipcBytes: this.schemaIpc };
   }
 
@@ -74,6 +78,23 @@ class StatementStub {
   public async close(): Promise<void> {
     this.closed = true;
   }
+
+  // Status accessors from the kernel's status-fields surface.
+  public async numModifiedRows(): Promise<number | null> {
+    return null;
+  }
+
+  public async displayMessage(): Promise<string | null> {
+    return null;
+  }
+
+  public async diagnosticInfo(): Promise<string | null> {
+    return null;
+  }
+
+  public async errorDetailsJson(): Promise<string | null> {
+    return null;
+  }
 }
 
 // Helper: attach `databricks.type_name` to a field so the SEA Thrift