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README.md

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+# arcline-check
+
+CLI tool that checks whether a domain is genuinely self-hosted or routing through a CDN or cloud provider (Cloudflare, Fastly, AWS CloudFront, etc.).
+
+Core to the Arcline brand — useful as a standalone tool for anyone who wants to verify a host's transparency claims.
+
+## Status
+
+Planned. Not yet started.
+
+## Stack
+
+- Go — single static binary
+- Targets: linux/amd64, darwin/arm64, windows/amd64
+- No runtime dependencies
+
+## Usage
+
+```sh
+arcline-check example.com
+arcline-check example.com --json
+arcline-check example.com --watch 30
+```
+
+## How it works
+
+1. Resolves domain to IP
+2. PTR/rDNS lookup
+3. ASN/org lookup (ip-api.com or self-hosted fallback)
+4. Checks IP against known CDN/cloud CIDR ranges
+5. Fetches HTTP headers and inspects for CDN fingerprints (CF-Ray, X-Served-By, Via, X-Cache)
+
+See [todo.md](todo.md) for the full task list and output format spec.