Documentation cleanup and bugfixes

internal/promptdef/testdata/unknown_input_field.yaml

@@ -0,0 +1,13 @@
+id: unknown-input-field
+version: "1.0.0"
+inputs:
+  - name: transcript
+    required: true
+    unknown_input_setting: true
+messages:
+  - role: user
+    content: "Hi"
+output:
+  format: text
+  validation_mode: none
+  repair_attempts: 0