Add LATEST.md + latest.json: data date, fresh API and licence links for code users

LATEST.md

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+# Latest version: Ziplore US ZIP Codes with Census Demographics (41,682 ZIPs)
+
+- **Data last updated:** 2026-09-24 · **refresh:** no fixed schedule (snapshot; refreshed when the source or product changes)
+- **Latest copy:** https://huggingface.co/datasets/CyberMax-tools/us-zip-codes-demographics (Kaggle mirror: https://www.kaggle.com/datasets/cybermaxtools/us-zip-codes-demographics)
+- **Need today's data, filtered or via API?** [Ziplore ZIP code API](https://data.cybermax-tools.workers.dev/buy/ziplore-api?s=hf-file-us-zip-codes-demographics) (200 free calls a day, then $19/month for 60,000)
+- [Coffermap FY2025 federal spending workbook](https://data.cybermax-tools.workers.dev/buy/coffermap?s=hf-file-us-zip-codes-demographics) ($15)
+- **Licence:** cc-by-4.0 (https://huggingface.co/datasets/CyberMax-tools/us-zip-codes-demographics#licence-and-attribution), unchanged and open for everyone
+- **Using it at work?** [Commercial license + support](https://data.cybermax-tools.workers.dev/buy/dataset-license?s=hf-file-us-zip-codes-demographics) (from $49/year): invoice, certificate, named support, SLA. Terms: https://cybermax.cybermax-tools.workers.dev/data-license/
+- **Email me when it updates:** https://data.cybermax-tools.workers.dev/notify?ds=us-zip-codes-demographics&s=hf-file-us-zip-codes-demographics
+
+Machine-readable: `latest.json` in this repo. Published by CyberMax.

README.md

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 ---
+# LATEST: https://huggingface.co/datasets/CyberMax-tools/us-zip-codes-demographics/blob/main/latest.json (data date, refresh cadence, fresh API, licence links; also LATEST.md)
+# API (fresh data): https://data.cybermax-tools.workers.dev/buy/ziplore-api?s=hf-file-us-zip-codes-demographics
+# Licence: cc-by-4.0 (open, unchanged); commercial licence + support: https://data.cybermax-tools.workers.dev/buy/dataset-license?s=hf-file-us-zip-codes-demographics
 license: cc-by-4.0
 pretty_name: Ziplore US ZIP Codes with Census Demographics (41,682 ZIPs)
 tags:

latest.json

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+{
+ "dataset": "CyberMax-tools/us-zip-codes-demographics",
+ "title": "Ziplore US ZIP Codes with Census Demographics (41,682 ZIPs)",
+ "data_updated": "2026-09-24",
+ "cadence": "no fixed schedule (snapshot; refreshed when the source or product changes)",
+ "latest": {
+  "huggingface": "https://huggingface.co/datasets/CyberMax-tools/us-zip-codes-demographics",
+  "kaggle": "https://www.kaggle.com/datasets/cybermaxtools/us-zip-codes-demographics",
+  "files": "https://huggingface.co/datasets/CyberMax-tools/us-zip-codes-demographics/tree/main"
+ },
+ "api": {
+  "name": "Ziplore ZIP code API",
+  "price": "200 free calls a day, then $19/month for 60,000",
+  "url": "https://data.cybermax-tools.workers.dev/buy/ziplore-api?s=hf-file-us-zip-codes-demographics"
+ },
+ "offers": [
+  {
+   "name": "Ziplore ZIP code API",
+   "price": "200 free calls a day, then $19/month for 60,000",
+   "url": "https://data.cybermax-tools.workers.dev/buy/ziplore-api?s=hf-file-us-zip-codes-demographics"
+  },
+  {
+   "name": "Coffermap FY2025 federal spending workbook",
+   "price": "$15",
+   "url": "https://data.cybermax-tools.workers.dev/buy/coffermap?s=hf-file-us-zip-codes-demographics"
+  }
+ ],
+ "license": {
+  "open": "cc-by-4.0",
+  "name": null,
+  "link": "https://huggingface.co/datasets/CyberMax-tools/us-zip-codes-demographics#licence-and-attribution",
+  "note": "The open licence of this dataset is unchanged and applies to everyone.",
+  "commercial": {
+   "name": "Commercial license + support",
+   "price": "from $49/year",
+   "url": "https://data.cybermax-tools.workers.dev/buy/dataset-license?s=hf-file-us-zip-codes-demographics",
+   "terms": "https://cybermax.cybermax-tools.workers.dev/data-license/"
+  }
+ },
+ "update_alerts": "https://data.cybermax-tools.workers.dev/notify?ds=us-zip-codes-demographics&s=hf-file-us-zip-codes-demographics",
+ "store": "https://cybermax.cybermax-tools.workers.dev/store/?utm_source=huggingface&utm_medium=file&utm_campaign=us-zip-codes-demographics",
+ "by": "CyberMax"
+}