refactor(predicates): return features instead of bool, add P00/P11 predicates
- Change predicate return type from `bool` to `features list option` to carry extracted event data (Summary, Day_start, Multi_day) alongside match results - Add `features` type with Generic_feature_presence, Summary, Day_start, Multi_day variants - Add P00 (has_summary) and P11 (override_events) predicates - Remove large commented-out icalendar/ptime type definitions - Refactor main.ml to group events by UID using a Map - Add get_y_m_d_from_timedesc helper to Utils
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