Using dsh-file-claim to provide file claiming and protection for parallel DSH sessions

`dsh-file-claim` is a DeepSeek Harness session and message plugin maintained by Nwflower, which provides file claiming and protection for concurrent sessions sharing the same workspace. Sessions must claim files before writing to them, and heartbeats can take over inactive occupied files. Conflicting changes are sent to an asynchronous merge queue based on git three-way merge, preventing parallel sessions from overwriting each other. This article verifies the installation commands according to the directory page, and explains the collaborative guardrails and the MIT license.