PR-7 (v0.18 dogfood probe-first) 머지 후 PR-5 의 test `ask_tool_routes_multi_hop_true_to_decompose_first` 가 stale empty-KB contract 로 deterministic fail. test-only fix — production code 0 touch.
- `minimal_config`: `score_gate = 0.0` (probe 의 second gate `top_score < score_gate` 우회, test config isolation).
- fixture `workspace_root/note.md`: "This note is about a compound containing X and Y in detail." — build_match_string 의 token_and branch (FTS5 implicit-AND) 가 `compound` + `about` + `and` 셋 다 매칭 필요. empirical SQLite REPL (V007 trigram DDL) 로 1 hit 확정.
- 기존 assertion 보존, single-pass branch 도 query "anything" 으로 fixture 미매칭 → NoChunks refusal 유지.
- 신규 `_multi_hop_short_circuits_when_probe_empty` test (REQUIRED — round-1 critic HIGH + verifier 격상): probe-empty short-circuit 의 MCP-layer wire shape pin (kebab-rag::multi_hop_empty_probe_pool_refuses_before_any_llm_call 은 RAG-layer 만 pin, MCP-layer 안전망 부재).
- module doc 갱신: 두 test 가 각각 pin 하는 contract enumerate. inline 주석 (line 94-101) 도 새 contract 정합.
- HOTFIXES.md 신규 dated entry \`## 2026-05-26 — HOTFIX #15 ...\` (date-top convention).
검증: cargo test --workspace -j 1 — 회귀 0 (known flaky 1 → 0). cargo clippy --workspace --all-targets -j 1 -- -D warnings clean.
Wire / behavior / version cascade: 0.
Refs: docs/superpowers/specs/2026-05-26-hotfix-15-mcp-ask-multi-hop-flaky-spec.md (review 3 rounds APPROVE)
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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