refactor: rename aris to aelis (#59)

Rename all references across the codebase: package names,
imports, source IDs, directory names, docs, and configs.

Co-authored-by: Ona <no-reply@ona.com>

packages/aelis-source-caldav/src/calendar-context.ts

@@ -0,0 +1,24 @@
+import type { ContextKey } from "@aelis/core"
+
+import { contextKey } from "@aelis/core"
+
+import type { CalDavEventData } from "./types.ts"
+
+/**
+ * Calendar context for downstream sources.
+ *
+ * Provides a snapshot of the user's upcoming CalDAV events so other sources
+ * can adapt (e.g. a commute source checking if there's a meeting soon).
+ */
+export interface CalendarContext {
+	/** Events happening right now */
+	inProgress: CalDavEventData[]
+	/** Next upcoming event, if any */
+	nextEvent: CalDavEventData | null
+	/** Whether the user has any events today */
+	hasTodayEvents: boolean
+	/** Total number of events today */
+	todayEventCount: number
+}
+
+export const CalDavCalendarKey: ContextKey<CalendarContext> = contextKey("aelis.caldav", "calendar")