test(cli): align disabled-provider expectation with daemon message

Daemon emits 'Provider <id> is disabled' for disabled providers (see
session.ts emitProviderDisabledResponse). The test was asserting the
older 'is not available' phrasing, which never matched the actual
output.

packages/cli/tests/15-provider.test.ts

@@ -235,7 +235,7 @@ try {
       );
       const output = modelsResult.stdout + modelsResult.stderr;
       assert(
-        output.includes("Provider claude is not available"),
+        output.includes("Provider claude is disabled"),
         "provider models should surface the daemon disabled error",
       );
       assert(