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/replier_llm_test.go

@@ -5,6 +5,7 @@ import (
 	"testing"
 
 	"github.com/kami/maven/internal/llm"
+	"github.com/kami/maven/internal/phraser"
 	"github.com/kami/maven/internal/router"
 	"github.com/kami/maven/internal/voice"
 )
@@ -67,3 +68,20 @@ var errTestLLMDown = errTest("llm down")
 type errTest string
 
 func (e errTest) Error() string { return string(e) }
+
+// grammarRecorder captures the request so the grammar can be asserted on.
+type grammarRecorder struct{ req llm.Req }
+
+func (g *grammarRecorder) Complete(_ context.Context, r llm.Req) (string, error) {
+	g.req = r
+	return `{"response":"записала","mood":"neutral"}`, nil
+}
+
+func TestLLMReplierCarriesTheResponseGrammar(t *testing.T) {
+	rec := &grammarRecorder{}
+	r := newLLMReplier(rec, nil)
+	r.Reply(router.Decision{Intent: router.IntentNote, Slots: router.Slots{Text: "кофе закончился"}})
+	if rec.req.Grammar != phraser.ResponseGrammar {
+		t.Errorf("grammar = %q, want phraser.ResponseGrammar", rec.req.Grammar)
+	}
+}