dsh-sms-webhook: DeepSeek Harness SMS Forwarding and Storage Plugin

`dsh-sms-webhook` is a web-based utility plugin for DeepSeek Harness designed to enable local agents to retrieve phone SMS messages. It runs an HTTP service on the computer to receive data pushed from a mobile SMS forwarding app and stores it to disk. The plugin provides the `sms_recent` and `sms_search` tools, supporting keyword filtering, full-text search, and automatic OTP code extraction. Data is persisted in JSONL format, with a maximum of 5,000 entries. Developers need to configure the forwarding destination URL and pay attention to network security to enable use cases such as verification code recognition and SMS archiving.