grammar: the last two model calls that were still free text

The replier and the meeting summariser were the two call sites without a
GBNF. Both are exactly the shape that makes a Thinking variant answer with
its reasoning as prose, and neither had anything downstream that could
remove it.

The replier already parses {"response","mood"}, so it now sends the phraser's
grammar for that contract, exported once as phraser.ResponseGrammar so the
two definitions cannot drift.

The summariser stays text-in/text-out. The JSON wrapper is attached and
unwrapped in the daemon's Completer, so internal/capture is unchanged and a
Completer without a grammar still works.

The simulator told routing from phrasing by "has a grammar", which stopped
being true here; it now looks for the intent enum.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

cmd/mavend/simulator_test.go

@@ -328,7 +328,10 @@ func (s *scriptedLLM) Complete(_ context.Context, r llm.Req) (string, error) {
 	s.mu.Lock()
 	defer s.mu.Unlock()
 	s.calls = append(s.calls, r)
-	routing := r.Grammar != ""
+	// A grammar no longer separates the two contracts — the replier carries one
+	// too since phraser.ResponseGrammar was attached to it. Only the router's
+	// grammar names the intent enum, so that is what tells them apart.
+	routing := strings.Contains(r.Grammar, "intent")
 	for _, e := range s.entries {
 		if e.Match != "" && !strings.Contains(strings.ToLower(r.User), strings.ToLower(e.Match)) {
 			continue