Minimal Odin HTTP server scaffold driven by OpenSpec.

Prerequisites:

• Odin compiler installed and available in PATH.

Default listen address:

• 127.0.0.1:8080

Override listen address via environment variable:

• ODIN_HTTP_ADDR=127.0.0.1:9090

Run command:

odin run ./cmd/server

1. Start server with odin run ./cmd/server.
2. Verify root endpoint:
   • curl -i http://localhost:8080/
   • Expect status 200 and body {"service":"odin-http-server","status":"ok"}
3. Verify health endpoint:
   • curl -i http://localhost:8080/health
   • Expect status 200 and body {"status":"ok"}
4. Verify unknown endpoint:
   • curl -i http://localhost:8080/unknown
   • Expect status 404 and JSON error response.
5. Verify environment override:
   • ODIN_HTTP_ADDR=127.0.0.1:9090 odin run ./cmd/server
   • curl -i http://localhost:9090/health