[Forge] Demo Allen Brain Expression tool with real data done analysis:8 coding:7 reasoning:7

Execute Allen Brain Expression tool against real genes (TREM2, APOE, MAPT, APP). Store results. Show on /forge page as demo execution. Create tool call chain: PubMed search -> gene expression lookup -> pathway analysis. This demonstrates the Forge layer end-to-end.

Git Commits (3)

{
  "requirements": {
    "coding": 7,
    "reasoning": 7,
    "analysis": 8
  }
}

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