Five new tools (events weren't in fable-mcp before). Split
start_date + start_time inputs combine into a naive datetime that
services/events.py interprets in the user's local timezone.
Sentinels for update:
- empty strings → leave unchanged
- duration_minutes=-1 → leave unchanged
- duration_minutes=0 → set to point event (NULL duration)
- start_date/start_time must BOTH be set to move the event
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
