feat(trace): record llm ranked list and chosen rank

internal/trace/writer.go

@@ -87,6 +87,14 @@ type Action struct {
 	// the model's short rationale, shown by the replay UI to explain the pick.
 	Source       string `json:"source,omitempty"`
 	LLMReasoning string `json:"llm_reasoning,omitempty"`
+	// LLMRanked is the model's full ranked candidate-index list; LLMChosenRank
+	// is the 1-based position in it that produced this action (1 = the model's
+	// top pick; >1 means earlier picks were invalid and skipped). Together they
+	// let the replay UI reconcile the reasoning with the executed action: the
+	// reasoning describes the model's top pick, so a ChosenRank > 1 is why the
+	// prose can name a different target than the one acted on.
+	LLMRanked     []int `json:"llm_ranked,omitempty"`
+	LLMChosenRank int   `json:"llm_chosen_rank,omitempty"`
 }
 
 type BoundsRecord struct {