fix(fleet): align migration preview and clean CI

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

packages/mosaic/src/fleet/v1-v2-migration.ts

@@ -1005,10 +1005,48 @@ function validateConnector(
 ): void {
   if (!present) return;
   rejectUnknownKeys(connector, new Set(['kind', 'matrix', 'discord']), 'connector', blockers);
-  const kind = stringValue(connector.kind);
+  const kind = typeof connector.kind === 'string' ? connector.kind : undefined;
   if (!kind || !['tmux', 'discord', 'matrix'].includes(kind)) {
     blockers.push(blocker('invalid-connector', 'connector.kind', 'Unsupported connector kind.'));
   }
+  if (kind === 'tmux') {
+    if (connector.matrix !== undefined) {
+      blockers.push(
+        blocker(
+          'invalid-connector',
+          'connector.matrix',
+          'Tmux connector must not define Matrix connector data.',
+        ),
+      );
+    }
+    if (connector.discord !== undefined) {
+      blockers.push(
+        blocker(
+          'invalid-connector',
+          'connector.discord',
+          'Tmux connector must not define Discord connector data.',
+        ),
+      );
+    }
+  }
+  if (kind === 'discord' && connector.matrix !== undefined) {
+    blockers.push(
+      blocker(
+        'invalid-connector',
+        'connector.matrix',
+        'Discord connector must not define Matrix connector data.',
+      ),
+    );
+  }
+  if (kind === 'matrix' && connector.discord !== undefined) {
+    blockers.push(
+      blocker(
+        'invalid-connector',
+        'connector.discord',
+        'Matrix connector must not define Discord connector data.',
+      ),
+    );
+  }
   if (kind === 'matrix' && connector.matrix === undefined) {
     blockers.push(
       blocker('invalid-connector', 'connector.matrix', 'Matrix connector data is required.'),