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fix(json): print replacer-emptied objects as {} when indenting

Json::stringify with indent > 0 wrote the line break and indentation
after `{` as soon as it opened a non-empty object, before the replacer
had decided whether any member survives. When every member was dropped
the object printed as `{`, a blank indented line, then `}` (e.g.
"{\n  \n}") instead of "{}".

Write the line break with each emitted member instead, and on close
only write it when a member was emitted. Output without a replacer or
without indentation is unchanged. Arrays are unaffected: the replacer
only applies to object members, so an array never loses elements.

Adds a differential test checking stringify(indent~, replacer~) against
transform(replacer).stringify(indent~).

Signed-off-by: Codex CLI <codex@openai.com>
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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