…stness

Fixes issues steipete#23, steipete#6, steipete#31, steipete#32 (partial) and implements PR steipete#13 feature:

- All-day reminders (issues steipete#23, steipete#6): Add ParsedDate type to DateParsing with
  isDateOnly flag. Date-only inputs (YYYY-MM-DD, today, tomorrow, etc.) now
  create true all-day reminders using only [year,month,day] DateComponents,
  omitting hour/minute so EventKit treats them as all-day. Timed inputs still
  include hour/minute. ReminderItem gains dueDateIsAllDay: Bool field. Display
  shows date without time for all-day reminders.

- Multiple list names (issue steipete#31): `remindctl list A B C` now returns merged
  results from all named lists. `remindctl show --list A --list B` also merges
  results (repeatable --list flag).

- edit --due fix (issue steipete#32): isDateOnly is now correctly threaded through
  ReminderUpdate so that editing a due date with a date-only string sets proper
  all-day components rather than midnight-timed ones.

- creationDate in JSON output (PR steipete#13): ReminderItem now exposes creationDate
  from EKCalendarItem.creationDate in all output modes.

- item(from:) helper: consolidate EKReminder → ReminderItem conversion to a
  single private method, used across createReminder, updateReminder, and
  completeReminders.

- 9 new tests covering ParsedDate, all-day flags, multiple list fetch, and
  backward-compat for parseUserDate.

…nds, and output

- AddCommand: --repeat, --alarm, --url, --parent, --tags flags
- EditCommand: same + --clear-alarm, --clear-repeat, --clear-url
- EventKitStore: full read/write for all new fields via EKReminder
- OutputFormatting: display recurrence, alarm, url, tags in text + JSON
- Cherry-picked model extensions from upstream PRs steipete#40, steipete#39, steipete#17, steipete#35, steipete#13

resolved conflict with steipete#29 refactor — creationDate added to item(from:) helper

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

…ete#30)

resolved conflicts with steipete#29 refactor and steipete#13 creationDate — added
dueDateIsAllDay to ReminderItem, item(from:), and fetchReminders

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>