moonbitlang / core / 7836

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feat: fill trait-impl gaps between sibling collections

- Compare for mutable sorted_map.SortedMap and sorted_set.SortedSet, with
  the same ordering as their immutable twins (size first, then
  lexicographic in ascending order); compare promoted, op_* deprecated.
- Default (the empty value) for immut/vector.Vector,
  immut/vector_map.VectorMap, immut/priority_queue.PriorityQueue and
  lazy_list.LazyList; the method promotion is deprecated per AGENTS.md.
- @debug.Debug for @js_async.JsError. JsValue::to_string no longer throws
  on null/undefined/unconvertible rejection values.

Part of #4694, part of #4613.

Codex: "Approved; no remaining blockers." (2 rounds)

Signed-off-by: Codex CLI <codex@openai.com>

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