Preserve context across conversation intents (V-542)

Owner explicitly requested direct commits to master; bypass the branch-only hook.

cmd/mavend/simulator_test.go

@@ -127,10 +127,14 @@ type toolRow struct {
 // Route and Reply are separate because the same model serves both contracts
 // (CLAUDE.md, "LLM output contract"): a grammar-constrained call is a routing
 // call and gets Route, an unconstrained one is a phrasing call and gets Reply.
+// HistoryContains makes a chat reply conditional on the transcript the daemon
+// supplied. It prevents a canned answer from making a continuity scenario pass
+// while the referent is still absent from the model input.
 type scriptEntry struct {
-	Match string `json:"match"`
-	Route string `json:"route,omitempty"`
-	Reply string `json:"reply,omitempty"`
+	Match           string   `json:"match"`
+	Route           string   `json:"route,omitempty"`
+	Reply           string   `json:"reply,omitempty"`
+	HistoryContains []string `json:"history_contains,omitempty"`
 }
 
 // step — one scripted moment. At is "HH:MM" or "HH:MM:SS", interpreted in the
@@ -369,7 +373,7 @@ type scriptedPhraser struct {
 // matches scriptedLLM: actionChat logs it and falls back to ChatFallback(), so a
 // scenario that never meant to assert on a chat reply behaves exactly as it did
 // before, and one that DID means to is told its script has a hole.
-func (p *scriptedPhraser) PhraseChat(_ context.Context, utterance string, _ []dialogue.Turn) (string, error) {
+func (p *scriptedPhraser) PhraseChat(_ context.Context, utterance string, history []dialogue.Turn) (string, error) {
 	for _, e := range p.entries {
 		if e.Reply == "" {
 			continue
@@ -377,6 +381,19 @@ func (p *scriptedPhraser) PhraseChat(_ context.Context, utterance string, _ []di
 		if e.Match != "" && !strings.Contains(strings.ToLower(utterance), strings.ToLower(e.Match)) {
 			continue
 		}
+		for _, want := range e.HistoryContains {
+			found := false
+			for _, turn := range history {
+				if containsFold(turn.Text, want) {
+					found = true
+					break
+				}
+			}
+			if !found {
+				return "", fmt.Errorf("simulator: chat history for %q does not contain %q: %+v",
+					truncateRunes(utterance, 60), want, history)
+			}
+		}
 		return chatReplyText(e.Reply), nil
 	}
 	return "", fmt.Errorf("simulator: no scripted chat reply for %q", truncateRunes(utterance, 60))