dsh-pet-heat: First Aid for Pet Heatstroke

The DeepSeek Harness plugin `dsh-pet-heat` is designed to meet the need for quickly obtaining first-aid protocols for pet heatstroke. Implemented in pure Node.js with no network dependencies, it provides a `pet_heat` tool that returns first-aid care plans based on parameters. Specific dependencies must be satisfied before installation, after which it can be invoked within a session. The code is open source under the MIT license and runs with the permissions of the current process.