Prompt (rr-iter2-010): Generate `implementation-summary.md` for the phase after the corpus seeding pass.
Expected skill: system-spec-kit

Advisor output:
[
  {
    "skill": "system-spec-kit",
    "kind": "skill",
    "confidence": 0.82,
    "uncertainty": 0.16,
    "passes_threshold": true,
    "reason": "Matched by native advisor_recommend",
    "source": "native",
    "score": 0.572438,
    "dominant_lane": "explicit_author",
    "status": "active",
    "_shadow": {
      "skillId": "system-spec-kit",
      "liveScore": 0.572438,
      "shadowScore": 0.500625,
      "delta": -0.071813,
      "dominantShadowLane": "explicit_author"
    }
  }
]
