Publish harness and TUI open-source

initial sync from the monorepo

crates/codegen/xai-grok-pager/tests/scenarios/mock_response.yaml

@@ -0,0 +1,24 @@
+name: mock-response
+description: Validate a real prompt submission renders mocked assistant output and captures the resulting UI.
+terminal:
+  rows: 40
+  cols: 110
+mock:
+  response: "SCRIPTED_MOCK_RESPONSE rendered by the real pager from the local mock inference server."
+steps:
+  - action: wait_for_text
+    text: Quit
+    timeout_ms: 20000
+  - action: type_text
+    text: "hello scripted tui"
+  - action: keys
+    keys: "<Enter>"
+  - action: wait_for_text
+    text: SCRIPTED_MOCK_RESPONSE
+    timeout_ms: 30000
+  - action: assert_chat_completion
+  - action: assert_not_contains
+    text: panicked
+  - action: screenshot
+    name: response
+    note: Prompt submission and mocked assistant response.