## 1. Discord Webhook Delivery

- [x] 1.1 Replace the URL stub constructor with validated `ΩRestEndpointΩ` and positive `Duration` construction, including connect-timeout and no-redirect client configuration.
- [x] 1.2 Implement direct notification-message validation and one synchronous Jackson JSON webhook POST with `wait=true`, headers, request timeout, and exact message content.
- [x] 1.3 Implement 2xx success handling and non-sensitive `IOException` handling for non-2xx, communication, timeout, and interrupted delivery without retries.
- [x] 1.4 Remove or update the private inline example so it cannot carry a credential or perform a network-executable example.

## 2. Verification

- [x] 2.1 Compile generated main sources and existing unchanged test sources, then run the normal assembly/build.
- [x] 2.2 Run strict validation of the active OpenSpec change and structural checks for the old URL constructor, stub, credentials, and prohibited scope changes.
- [x] 2.3 Review the complete diff, confirm no test or generated source changes, and commit the scoped implementation.
