[SaKaNa-Y]

Summary

Scripts using --json expect a JSON response even when a command fails. An unknown option or missing argument instead leaves stdout empty and writes plain text to stderr, so the caller cannot read the error through the documented contract.

Use the parser's JSON option and matched command to return the existing error envelope. Keep exit code 2 and the current text output outside JSON mode.

 parameter validation fails
- write plain text to stderr
+ in JSON mode, write the error envelope to stdout
+ otherwise, write plain text to stderr
 exit with code 2

Evidence

• Before: all four new JSON subprocess cases failed because stderr contained the error and stdout was empty.
• After: all seven cases pass, covering unknown options, missing arguments, missing option values, the default command, text mode, --no-json, and literal arguments after --.
• pnpm lint, pnpm knip, pnpm test --run (934 tests), pnpm typecheck, and pnpm build passed.

Merge Danger

Door: two-way

Blast Radius: CLI

The change affects parameter-validation failures in JSON mode. It preserves the existing envelope shape and exit code.

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