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## Problem Users commonly type `claw doctor --json`, `claw status --json`, or `claw system-prompt --json` expecting JSON output. These fail with `unrecognized argument \`--json\` for subcommand` with no hint that `--output-format json` is the correct flag. ## Discovery Filed as #152 during 21:17 dogfood nudge. The #127 worktree contained a more comprehensive patch but conflicted with #141 (unified --help). On re-investigation of main, Bugs 1 and 3 from #127 are already closed (positional arg rejection works, no double "error:" prefix). Only Bug 2 (the `--json` hint) remained. ## Fix Two call sites add the hint: 1. `parse_single_word_command_alias`'s diagnostic-verb suffix path: when rest[1] == "--json", append "Did you mean \`--output-format json\`?" 2. `parse_system_prompt_options` unknown-option path: same hint when the option is exactly `--json`. ## Verification Before: $ claw doctor --json error: unrecognized argument `--json` for subcommand `doctor` Run `claw --help` for usage. After: $ claw doctor --json error: unrecognized argument `--json` for subcommand `doctor` Did you mean `--output-format json`? Run `claw --help` for usage. Covers: `doctor --json`, `status --json`, `sandbox --json`, `system-prompt --json`, and any other diagnostic verb that routes through `parse_single_word_command_alias`. Other unrecognized args (`claw doctor garbage`) correctly don't trigger the hint. ## Tests - 2 new assertions in `parses_multiple_diagnostic_subcommands`: - `claw doctor --json` produces hint - `claw doctor garbage` does NOT produce hint - 177 rusty-claude-cli tests pass - Workspace tests green Closes ROADMAP #152.