v1.9.0 — One-Shot Time Reminders

Fixes

• Time reminders fire once — max_fires defaults to 1 for time triggers (auto-completes after firing). No more duplicate notifications.
• Keyword/session/heartbeat triggers unchanged — still fire unlimited by default
• Recurring reminders unchanged — --recur keeps unlimited fires

Features

• --cooldown <seconds> — configurable dedup cooldown for watch daemon (default: 300s)

Stats

• 478 tests passing (12 new)