docs: add comprehensive static daily reminders documentation

- Add static daily reminders to README.md core features and API reference
- Create detailed usage guide in USAGE.md with examples and best practices
- Add version 2.1.0 changelog entry documenting new reminder functionality
- Create examples/static-daily-reminders.ts with complete usage examples
- Update test-apps README to include reminder testing capabilities

The static daily reminder feature provides simple daily notifications
without network content dependency, supporting cross-platform scheduling
with rich customization options.

src/definitions.ts

@@ -103,6 +103,35 @@ export interface PermissionStatus {
   carPlay?: boolean;
 }
 
+// Static Daily Reminder Interfaces
+export interface DailyReminderOptions {
+  id: string;
+  title: string;
+  body: string;
+  time: string; // HH:mm format (e.g., "09:00")
+  sound?: boolean;
+  vibration?: boolean;
+  priority?: 'low' | 'normal' | 'high';
+  repeatDaily?: boolean;
+  timezone?: string;
+}
+
+export interface DailyReminderInfo {
+  id: string;
+  title: string;
+  body: string;
+  time: string;
+  sound: boolean;
+  vibration: boolean;
+  priority: 'low' | 'normal' | 'high';
+  repeatDaily: boolean;
+  timezone?: string;
+  isScheduled: boolean;
+  nextTriggerTime?: number;
+  createdAt: number;
+  lastTriggered?: number;
+}
+
 export type PermissionState = 'prompt' | 'prompt-with-rationale' | 'granted' | 'denied' | 'provisional' | 'ephemeral' | 'unknown';
 
 // Additional interfaces for enhanced functionality
@@ -364,6 +393,28 @@ export interface DailyNotificationPlugin {
   refreshAuthenticationForNewIdentity(activeDid: string): Promise<void>;
   clearCacheForNewIdentity(): Promise<void>;
   updateBackgroundTaskIdentity(activeDid: string): Promise<void>;
+
+  // Static Daily Reminder Methods
+  /**
+   * Schedule a simple daily reminder notification
+   * No network content required - just static text
+   */
+  scheduleDailyReminder(options: DailyReminderOptions): Promise<void>;
+
+  /**
+   * Cancel a daily reminder notification
+   */
+  cancelDailyReminder(reminderId: string): Promise<void>;
+
+  /**
+   * Get all scheduled daily reminders
+   */
+  getScheduledReminders(): Promise<DailyReminderInfo[]>;
+
+  /**
+   * Update an existing daily reminder
+   */
+  updateDailyReminder(reminderId: string, options: DailyReminderOptions): Promise<void>;
 }
 
 // Phase 1: TimeSafari Endorser.ch API Interfaces