Pinpoint #169: typed-error classifier gap discovered during dogfood probe.
`claw --output-format json --output-format xml doctor` was emitting:
{"error": "unsupported value for --output-format: xml ...",
"hint": null,
"kind": "unknown",
"type": "error"}
After fix:
{"error": "unsupported value for --output-format: xml ...",
"hint": "Run `claw --help` for usage.",
"kind": "cli_parse",
"type": "error"}
The change adds two new classifier branches to `classify_error_kind`:
1. `unsupported value for --` → cli_parse
2. `missing value for --` → cli_parse
Covers all `CliOutputFormat::parse` / `parse_permission_mode_arg` rejections
and any future flag-value validation messages using the same pattern.
Side benefit: the #247 hint synthesizer ("Run `claw --help` for usage.")
now triggers automatically because the error is now correctly classified
as cli_parse. Consumers get both correct kind AND helpful hint.
Test added:
- `classify_error_kind_covers_flag_value_parse_errors_169` (4 positive +
1 sanity case)
Tests: 224/224 pass (+1 from #169).
Discovered during dogfood probe 2026-04-23 07:00 Seoul, cycle #94.
Refs: #169, typed-error family (#121, #127, #129, #130, #164, #247)
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