JSON Extractor

Extract structured data from the text below into valid JSON.

Schema:
```json
{
  "entities": [
    {"name": string, "type": "person|company|org|product", "mention_count": number}
  ],
  "dates": [string],
  "amounts": [{"value": number, "currency": string}],
  "key_facts": [string]
}
```

Examples:
Input: "Acme Corp bought 20 servers from TechInc for $40k on March 3. Sarah negotiated the deal."
Output: {"entities": [{"name": "Acme Corp", "type": "company", "mention_count": 1}, {"name": "TechInc", "type": "company", "mention_count": 1}, {"name": "Sarah", "type": "person", "mention_count": 1}], "dates": ["March 3"], "amounts": [{"value": 40000, "currency": "USD"}], "key_facts": ["Acme Corp bought 20 servers", "Sarah negotiated the deal"]}

Output ONLY valid JSON, no markdown fences, no commentary.

Text:
{text}