maven: calendar event querying (task 3)

Store: CalendarEvents(ctx, from, to) — filters caldav facts by key date prefix.
IPC: full wiring through interface, server dispatch, and client.
Router: ParseCalendarDate (сегодня/завтра), CalendarEventFormatter (RU reply).
Voice: calendar detection before notes RAG in IntentQuery handler.
Tests: store integration test, date parser tests, formatter tests.

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

internal/router/calendar.go

@@ -0,0 +1,19 @@
+package router
+
+import (
+	"fmt"
+	"strings"
+	"time"
+)
+
+// CalendarEventFormatter formats calendar events into a Russian reply string.
+type CalendarEventFormatter struct{}
+
+// Format returns a Russian reply for the given calendar events on the given date.
+func (CalendarEventFormatter) Format(events []string, date time.Time) string {
+	dateStr := date.Format("02.01.2006")
+	if len(events) == 0 {
+		return fmt.Sprintf("на %s ничего нет.", dateStr)
+	}
+	return fmt.Sprintf("на %s: %s", dateStr, strings.Join(events, "; "))
+}

internal/router/calendar_test.go

@@ -0,0 +1,26 @@
+package router
+
+import (
+	"testing"
+	"time"
+)
+
+func TestCalendarEventFormatter(t *testing.T) {
+	f := CalendarEventFormatter{}
+	date := time.Date(2026, 7, 6, 0, 0, 0, 0, time.UTC)
+
+	// Empty
+	if got := f.Format(nil, date); got != "на 06.07.2026 ничего нет." {
+		t.Errorf("empty: got %q", got)
+	}
+
+	// One event
+	if got := f.Format([]string{"Standup @ 10:00-10:30"}, date); got != "на 06.07.2026: Standup @ 10:00-10:30" {
+		t.Errorf("one: got %q", got)
+	}
+
+	// Multiple events
+	if got := f.Format([]string{"Standup @ 10:00-10:30", "Lunch @ 12:00-13:00"}, date); got != "на 06.07.2026: Standup @ 10:00-10:30; Lunch @ 12:00-13:00" {
+		t.Errorf("multiple: got %q", got)
+	}
+}

internal/router/slots.go

@@ -327,3 +327,17 @@ func parseDurationValue(s string) (string, bool) {
 	}
 	return strconv.Itoa(n) + unit, true
 }
+
+// ParseCalendarDate detects RU calendar date words in text and returns the
+// resolved time (midnight UTC+0 for "сегодня"/"today", next day for "завтра"/"tomorrow").
+// Returns zero time + false if no match.
+func ParseCalendarDate(text string, now time.Time) (time.Time, bool) {
+	lower := strings.ToLower(text)
+	if strings.Contains(lower, "сегодня") || strings.Contains(lower, "today") {
+		return now.Truncate(24 * time.Hour), true
+	}
+	if strings.Contains(lower, "завтра") || strings.Contains(lower, "tomorrow") {
+		return now.Truncate(24 * time.Hour).Add(24 * time.Hour), true
+	}
+	return time.Time{}, false
+}

internal/router/slots_ru_test.go

@@ -1,6 +1,9 @@
 package router
 
-import "testing"
+import (
+	"testing"
+	"time"
+)
 
 // Russian capture must produce the same keys the loop's care rules read, or a
 // ru voice test silently writes nothing and the nudges look broken.
@@ -28,3 +31,28 @@ func TestDefaultFactParserRU(t *testing.T) {
 		}
 	}
 }
+
+func TestParseCalendarDate(t *testing.T) {
+	now := time.Date(2026, 7, 6, 14, 30, 0, 0, time.UTC)
+	cases := []struct {
+		text string
+		want time.Time
+		ok   bool
+	}{
+		{"что у меня сегодня по плану", time.Date(2026, 7, 6, 0, 0, 0, 0, time.UTC), true},
+		{"что завтра", time.Date(2026, 7, 7, 0, 0, 0, 0, time.UTC), true},
+		{"планы на сегодня", time.Date(2026, 7, 6, 0, 0, 0, 0, time.UTC), true},
+		{"расписание на завтра", time.Date(2026, 7, 7, 0, 0, 0, 0, time.UTC), true},
+		{"what's today", time.Date(2026, 7, 6, 0, 0, 0, 0, time.UTC), true},
+		{"tomorrow plans", time.Date(2026, 7, 7, 0, 0, 0, 0, time.UTC), true},
+		{"какая погода", time.Time{}, false},
+		{"сколько времени", time.Time{}, false},
+		{"", time.Time{}, false},
+	}
+	for _, c := range cases {
+		got, ok := ParseCalendarDate(c.text, now)
+		if ok != c.ok || !got.Equal(c.want) {
+			t.Errorf("ParseCalendarDate(%q) = %v, %v; want %v, %v", c.text, got, ok, c.want, c.ok)
+		}
+	}
+}