docs: fix DNS authentication to use root domain instead of _mcp-registry subdomain

Updates DNS authentication documentation to correctly specify that TXT
records should be placed at the root domain (e.g., example.com) rather
than the _mcp-registry subdomain.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

:house: Remote-Dev: homespace

Author: domdomegg

docs/explanations/namespacing.md

@@ -22,7 +22,7 @@ Publishing to a namespace requires proving you control the corresponding identit
 - OIDC tokens in GitHub Actions workflows
 
 **Domain namespaces** (`com.company.*`):
-- DNS verification: TXT record at `_mcp-registry.company.com`
+- DNS verification: TXT record at `company.com`
 - HTTP verification: File at `https://company.com/.well-known/mcp-registry-auth`
 
 ## Namespace Scoping

docs/guides/publishing/publish-server.md

@@ -302,7 +302,7 @@ This opens your browser for OAuth authentication.
 openssl genpkey -algorithm Ed25519 -out key.pem
 
 # Get public key for DNS record
-echo "_mcp-registry.yourcompany.com. IN TXT \"v=MCPv1; k=ed25519; p=$(openssl pkey -in key.pem -pubout -outform DER | tail -c 32 | base64)\""
+echo "yourcompany.com. IN TXT \"v=MCPv1; k=ed25519; p=$(openssl pkey -in key.pem -pubout -outform DER | tail -c 32 | base64)\""
 
 # Add the TXT record to your DNS, then login
 mcp-publisher login dns --domain yourcompany.com --private-key $(openssl pkey -in key.pem -noout -text | grep -A3 "priv:" | tail -n +2 | tr -d ' :\n')

docs/reference/cli/commands.md

@@ -91,7 +91,7 @@ openssl genpkey -algorithm Ed25519 -out key.pem
 openssl pkey -in key.pem -pubout -outform DER | tail -c 32 | base64
 
 # Add DNS TXT record:
-# _mcp-registry.example.com. IN TXT "v=MCPv1; k=ed25519; p=PUBLIC_KEY"
+# example.com. IN TXT "v=MCPv1; k=ed25519; p=PUBLIC_KEY"
 
 # Extract private key for login
 openssl pkey -in key.pem -noout -text | grep -A3 "priv:" | tail -n +2 | tr -d ' :\n'