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refactor: declarative comprehension in Debug for Queue / immut/HashSet

Replace the two-pass `iter().to_array().map(...)` with a single-pass
array comprehension `[for x in self => @debug.to_repr(x)]` in two
identically-shaped Debug impls.

Drops one intermediate allocation per call. Both impls are debug-only
serialization (`@debug.to_repr` / `debug_inspect`), not on any hot path.

Semantics-preserving: `moon test -p queue` (143/143) and
`moon test -p immut/hashset` (58/58) pass; `moon info` produces no
`.mbti` change.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

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