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refactor(argparse): use Map([]) literal across remaining sites

Replace the typed-empty-Map idiom `Map[K,V] = {}` with `Map([])` in:
- parser_validate.mbt: `group_presence` accumulator
- command.mbt: `env?` parameter default in `Command::parse`
- command.mbt: two positional empty-Map args in the `parse_command` call
- command.mbt: four local accumulators in `build_matches`
  (`flags`, `values`, `flag_counts`, `sources`)

Type ascriptions were dropped from the locals — they are inferred from
subsequent populating writes; left in place where the binding is the
function default (public-API surface).

Semantics-preserving: `moon test -p argparse` (225/225) passes and
`moon info` produces no `.mbti` change.

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

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