feat: add fme_feature_flag list with pagination via Split.io API

Adds fme_feature_flag resource type with list operation using
GET /internal/api/v2/splits/ws/{wsId}. Supports offset and limit
query params (default 20, max 50 per Split.io docs).

Parity with harness/mcp-server#34.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: thisrohangupta

src/registry/toolsets/feature-flags.ts

@@ -57,6 +57,29 @@ export const featureFlagsToolset: ToolsetDefinition = {
         },
       },
     },
+    {
+      resourceType: "fme_feature_flag",
+      displayName: "FME Feature Flag",
+      description:
+        "Feature flag via the Split.io API. List flags by workspace with pagination (offset/size, default 20, max 50). Does not require an environment.",
+      toolset: "feature-flags",
+      scope: "account",
+      identifierFields: ["workspace_id", "feature_flag_name"],
+      listFilterFields: ["offset"],
+      operations: {
+        list: {
+          method: "GET",
+          path: "/internal/api/v2/splits/ws/{wsId}",
+          pathParams: { workspace_id: "wsId" },
+          queryParams: {
+            offset: "offset",
+            size: "limit",
+          },
+          responseExtractor: passthrough,
+          description: "List feature flags for a workspace with pagination (offset and size params, max 50)",
+        },
+      },
+    },
     {
       resourceType: "feature_flag",
       displayName: "Feature Flag",