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/loop/explain.go

@@ -27,12 +27,12 @@ type RuleTrace struct {
 
 // GateDetail — snapshot of the values the gate checked.
 type GateDetail struct {
-	SnoozeUntil     *time.Time `json:"snooze_until,omitempty"`
-	CooldownUntil   *time.Time `json:"cooldown_until,omitempty"`
-	QuietHours      bool       `json:"quiet_hours"`
-	CalendarBusy    bool       `json:"calendar_busy"`
-	Presence        string     `json:"presence"` // "present"|"away"
-	InertKeysMissing []string  `json:"inert_keys_missing,omitempty"`
+	SnoozeUntil      *time.Time `json:"snooze_until,omitempty"`
+	CooldownUntil    *time.Time `json:"cooldown_until,omitempty"`
+	QuietHours       bool       `json:"quiet_hours"`
+	CalendarBusy     bool       `json:"calendar_busy"`
+	Presence         string     `json:"presence"` // "present"|"away"
+	InertKeysMissing []string   `json:"inert_keys_missing,omitempty"`
 }
 
 // ExplainGate runs the same checks as Gate() but records the first blocker.