chore(cli): PR #171 회차 1 리뷰 반영

`answer.schema.json` 의 `refusal_reason` description 의 PR 번호 정정:
`multi_hop_decompose_failed` 도입 시점 = PR-2 (#167, RefusalReason variant
+ ask_multi_hop decompose-failure 분기). PR-3a (#168) 는 `Answer.hops`
field + RagCfg knob 만 — refusal variant 와 무관.

검증
- `cargo test -p kebab-cli -j 1 --test wire_ask_multi_hop` 4 모두 통과.

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

docs/wire-schema/v1/answer.schema.json

@@ -35,7 +35,7 @@
         },
         { "type": "null" }
       ],
-      "description": "p9-fb-41: `multi_hop_decompose_failed` added in PR-3a for the multi-hop pipeline (only emitted when AskOpts.multi_hop = true and the decompose LLM call fails to parse). Other variants are unchanged from earlier phases."
+      "description": "p9-fb-41: `multi_hop_decompose_failed` added in PR-2 alongside the multi-hop pipeline skeleton (only emitted when AskOpts.multi_hop = true and the decompose LLM call fails to parse). Other variants are unchanged from earlier phases."
     },
     "model":                   { "type": "object" },
     "embedding":               { "type": ["object", "null"] },