curl -H "X-API-Key: gld_your_key" \
  "https://api.gildea.ai/v1/themes?axis=value_chain"

{
  "data": [
    {
      "axis": "value_chain",
      "label": "Foundation Models",
      "signal_count": 245,
      "trend": {
        "momentum_wow": 0.15,
        "momentum_4w": 0.20,
        "acceleration": 0.05,
        "z_score": 1.8,
        "persistence": 1.0,
        "share_of_voice": 0.22,
        "share_of_voice_history": [0.18, 0.19, 0.20, 0.22],
        "streak": 3,
        "current_week": 28,
        "prior_week": 24
      }
    },
    {
      "axis": "value_chain",
      "label": "AI Infrastructure",
      "signal_count": 198,
      "trend": {
        "momentum_wow": 0.08,
        "momentum_4w": 0.12,
        "acceleration": -0.02,
        "z_score": 1.2,
        "persistence": 0.92,
        "share_of_voice": 0.18,
        "share_of_voice_history": [0.16, 0.17, 0.17, 0.18],
        "streak": 2,
        "current_week": 22,
        "prior_week": 20
      }
    }
  ]
}