test: add grok-build to run-providers.ss live smoke (add-grok phase 7 fixup)

ober

68549708244585d21d2ddc9f3c51097a9d8cb738

diff --git a/test/run-providers.ss b/test/run-providers.ss
index 4cc803c..3ad2f27 100644
--- a/test/run-providers.ss
+++ b/test/run-providers.ss
@@ -70,6 +70,10 @@
     ("deepseek"    . "deepseek-chat")
     ("google"      . "gemini-2.5-flash")
     ("xai"         . "grok-3-mini")
+    ;; "grok" = Grok CLI session-token provider. config-get-provider-key
+    ;; auto-skips when nothing in env / store / config / ~/.grok yields a
+    ;; usable token, so no special-case needed in test-provider above.
+    ("grok"        . "grok-build")
     ("groq"        . "llama-3.1-8b-instant")
     ("mistral"     . "mistral-small-latest")
     ("together"    . "meta-llama/Llama-3.3-70B-Instruct-Turbo")