catena v1.1.0

The first usable release. v1.0.0 was published briefly and withdrawn;
it is retracted in go.mod and should not be used. Start here.

The library

• Seq[T] — lazy iter.Seq[T] with 84 methods (37 chainable), built on Go
  1.27 generic methods; range works directly and conversion to and from
  the standard iterator types is free.
• Try[T] — fallible sequences where the consumer chooses the error
  policy (Collect aborts, CollectAll gathers, Ignore skips), under
  five uniform rules for how errors flow through intermediates.
• Seq2[K, V] — the stdlib pair bridge; List[T] — the eager mirror,
  generated and conformance-checked to agree with AsSeq().
• The memory-class operators: FoldBy (grouped aggregation bounded by
  keys, not elements), TopNBy/BottomNBy (bounded stable heap),
  DedupeBy (O(1) streaming distinct), ChunkedBy, Windowed, JoinBy
  (relational inner join).
• Every operator's contract — argument edges, memory class, drain class,
  ordering and tie policy, error semantics — specified in SPEC.md and
  enforced by the C1–C15 conformance suite, a completeness check that
  fails CI for any unregistered export, property tests, and 100%
  statement coverage of the library.
• An operator reference covering all 182 operators, each with a worked
  example that go test runs and whose output it verifies.
• examples/ — eight runnable programs, all executed in CI.
• Performance measured three ways (hand loop / raw iter.Seq closures /
  catena) with the standing rule that catena meets the raw mechanism
  wherever the two compile on equal terms — it wins on multi-stage
  pipelines and terminals, and trails by 4–13% on single-stage shapes,
  where the baseline inlines into its consumer and a library call cannot.
  Operators compose by direct source invocation rather than
  range, which makes a 4-stage pipeline 25% faster than the same
  pipeline hand-built from raw closures.