DeepSeek Harness Plugin: merenguesl/dsh-tool-normalizer

`dsh-tool-normalizer` is a self-healing plugin for DeepSeek Harness (DSH), located in the `tools/execute` pipeline, designed to fix failed model tool calls. By filling in missing `description` fields, resolving relative paths, automatically repairing schemas, and retrying file operations, this plugin reduces full-token retries and billing consumption caused by errors, significantly improving the stability and reliability of the agent.