Current-state KB inventory shape

curl --request GET \
  --url https://api-sandbox.featherhq.com/v1/analytics/knowledge/inventory \
  --header 'x-api-key: <api-key>'

{
  "summary": {
    "total_documents": 123,
    "total_chunks": 123,
    "total_tokens": 123,
    "normalized_pct": 123,
    "documents_failed_now": 123,
    "documents_processing_now": 123,
    "knowledge_bases_count": 123
  },
  "by_source_type": [
    {
      "source_type": "<string>",
      "documents": 123,
      "chunks": 123,
      "tokens": 123
    }
  ],
  "by_hash_method": [
    {
      "hash_method": "<string>",
      "documents": 123,
      "chunks": 123,
      "tokens": 123
    }
  ],
  "growth": {
    "created_24h": 123,
    "created_7d": 123,
    "created_30d": 123,
    "failed_7d": 123,
    "cleaned_up_7d": 123
  }
}