Monotonic Collections: a middle ground between immutable and fully mutable

Explores monotonic collections as an intermediate approach between immutable and mutable data structures. Monotonic collections allow append-only operations while maintaining logical monotonicity—once a predicate is true, it remains true. This property enables simplified concurrency and distributed systems without coordination protocols (per CALM principle). Proposes a novel class hierarchy separating read-only views from mutation operations using a CQRS-like pattern, with ImmutableList extending MonotonicList extending List, paired with separate ListAppender and ListUpdater interfaces for modifications.