dsh-guest-table: Wedding Banquet Table Calculator

The `dsh-guest-table` plugin in DeepSeek Harness (DSH) is dedicated to calculating the number of tables for wedding banquets. Maintained by developer uckkk, it offers parameter-based precise calculations, is fully implemented in Node, and requires no network access. Developers need to satisfy the `@deepseek-ai/cordis` and `@deepseek-ai/dsh-tools` dependencies and install it through the specified command, after which the tool can be called directly during a session to obtain results.