Document decode harness one-shot mechanism

src/aituner/llm.py

@@ -251,6 +251,9 @@ def build_prompt(
                     "window_id": study.trace.window_id,
                     "request_mode": study.trace.request_mode,
                     "completion_tokens_override": study.trace.completion_tokens_override,
+                    "early_stop_max_lag_s": study.trace.early_stop_max_lag_s,
+                    "early_stop_max_elapsed_s": study.trace.early_stop_max_elapsed_s,
+                    "restart_engine_after_early_stop": study.trace.restart_engine_after_early_stop,
                     "input_length_filter": (
                         {
                             "min_input_tokens": study.trace.input_length_filter.min_input_tokens,

src/aituner/spec.py

@@ -406,7 +406,7 @@ class TraceSpec:
                     context="trace.restart_engine_after_early_stop",
                 )
                 if data.get("restart_engine_after_early_stop") is not None
-                else False
+                else request_mode == "decode_only"
             ),
         )