Prompt (rr-iter2-003): Add a `corpus/` subdirectory under the routing-accuracy phase and create a starter `labeled-prompts.jsonl`.
Expected skill: system-spec-kit

Advisor output:
[
  {
    "skill": "system-spec-kit",
    "kind": "skill",
    "confidence": 0.8267,
    "uncertainty": 0.16,
    "passes_threshold": true,
    "reason": "Matched by native advisor_recommend",
    "source": "native",
    "score": 0.599063,
    "dominant_lane": "explicit_author",
    "status": "active",
    "_shadow": {
      "skillId": "system-spec-kit",
      "liveScore": 0.599063,
      "shadowScore": 0.54175,
      "delta": -0.057313,
      "dominantShadowLane": "explicit_author"
    }
  },
  {
    "skill": "sk-code",
    "kind": "skill",
    "confidence": 0.82,
    "uncertainty": 0.16,
    "passes_threshold": true,
    "reason": "Matched by native advisor_recommend",
    "source": "native",
    "score": 0.566063,
    "dominant_lane": "explicit_author",
    "status": "active",
    "_shadow": {
      "skillId": "sk-code",
      "liveScore": 0.566063,
      "shadowScore": 0.516375,
      "delta": -0.049688,
      "dominantShadowLane": "explicit_author"
    }
  },
  {
    "skill": "sk-improve-prompt",
    "kind": "skill",
    "confidence": 0.82,
    "uncertainty": 0.24,
    "passes_threshold": true,
    "reason": "Matched by native advisor_recommend",
    "source": "native",
    "score": 0.3625,
    "dominant_lane": "explicit_author",
    "status": "active",
    "_shadow": {
      "skillId": "sk-improve-prompt",
      "liveScore": 0.3625,
      "shadowScore": 0.320833,
      "delta": -0.041667,
      "dominantShadowLane": "explicit_author"
    }
  },
  {
    "skill": "sk-doc",
    "kind": "skill",
    "confidence": 0.82,
    "uncertainty": 0.3,
    "passes_threshold": true,
    "reason": "Matched by native advisor_recommend",
    "source": "native",
    "score": 0.116156,
    "dominant_lane": "lexical",
    "status": "active",
    "_shadow": {
      "skillId": "sk-doc",
      "liveScore": 0.116156,
      "shadowScore": 0.121938,
      "delta": 0.005782,
      "dominantShadowLane": "lexical"
    }
  }
]
