maven: fix test mocks for CalendarEvents interface (verification)

- Add CalendarEvents method to recordingAPI in auth_test.go
- Add CalendarEvents method to fakeCore in handlers_test.go

Co-Authored-By: opencode <opencode@anthropic.com>

internal/voice/session.go

@@ -30,16 +30,16 @@ import (
 // the registry reads lastActive via LastActive; the conn is closed when
 // the client disconnects (serveConn returns) or the server shuts down.
 type Session struct {
-	ID        uint64
-	Surface   Surface
+	ID         uint64
+	Surface    Surface
 	RemoteAddr string
 
 	// lastActive — last time we heard from this client (request frame OR
 	// Pong). PickRecent selects the max-lastActive session for routing.
 	lastActive atomic.Int64 // unix nano
 
-	mu   sync.Mutex
-	conn net.Conn
+	mu     sync.Mutex
+	conn   net.Conn
 	closed bool
 }
 
@@ -92,9 +92,9 @@ func (s *Session) shutdown() {
 // voicesink (same pointer; the daemon passes one to both). Mutex around the
 // map; per-session conn writes use the session's own lock.
 type Sessions struct {
-	mu      sync.Mutex
-	sess    map[uint64]*Session
-	nextID  uint64
+	mu     sync.Mutex
+	sess   map[uint64]*Session
+	nextID uint64
 }
 
 func NewSessions() *Sessions {
@@ -111,10 +111,10 @@ func (r *Sessions) Add(c net.Conn, surface Surface) *Session {
 	defer r.mu.Unlock()
 	r.nextID++
 	s := &Session{
-		ID:        r.nextID,
-		Surface:   surface,
+		ID:         r.nextID,
+		Surface:    surface,
 		RemoteAddr: c.RemoteAddr().String(),
-		conn:      c,
+		conn:       c,
 	}
 	s.setLastActive(time.Now())
 	r.sess[s.ID] = s
@@ -170,4 +170,3 @@ func (r *Sessions) PushToMostRecent(ctx context.Context, p AudioNudgePush) error
 	}
 	return best.pushAudio(p)
 }
-