refactor: replace predicate-based event matching with collector pipeline

- Simplify `.ocamlformat` to use `default` profile with fewer overrides
- Extract shared types and utilities into a `remind_sync` library
  (`icalendar_augmented`, `ptime_augmented`, `timedesc_augmented`,
  `result_augmented`, `utf8`)
- Replace `eventTransformer.ml` and the predicate system in
  `eventPredicates.ml` with a sequential collector pipeline
  (`collect_uuid`, `collect_summary`, `collect_start_end_duration`,
  etc.)
- Simplify `Remind.rem` to a flat record with `Timedesc` date/time
  fields and replace `rem_to_string` with a leaner `string_of_rem`
- Add `separate_master_and_recurrence` and `get_recurrence_id` helpers
  to `utils.ml`
- Wire `main.ml` to call `EventPredicates.remind_of_event` per UID group
  and print results directly
- Remove `eventTransformer` module from `bin/dune` and enable the
  `remind_sync` library dependency

.ocamlformat

@@ -1,19 +1,7 @@
+profile = default
 version = 0.29.0
-profile = conventional
 
+margin = 120
 break-cases = fit-or-vertical
 break-infix = fit-or-vertical
-break-separators = after
-cases-exp-indent = 2
 exp-grouping = preserve
-if-then-else = keyword-first
-leading-nested-match-parens = false
-let-and = sparse
-margin = 120
-space-around-arrays = false
-space-around-lists = false
-space-around-records = false
-space-around-records = true
-space-around-variants = false
-type-decl = sparse
-wrap-fun-args = false