DeepSeek Harness Plugin: dsh-preset-anchored-standard

The `dsh-preset-anchored-standard` plugin addresses early-stage model behavior constraints in DeepSeek Harness trajectory evaluation by controlling when toolsets are exposed. It enforces that only `bash` and `str_replace_editor` are used in the first round of a session, then unlocks the full Standard tool catalog once it detects the first persistent promotion signal, such as a tool call or assistant message. Additionally, it injects a behavior-guidance notification during the promotion step, explaining the difference between background jobs and foreground polling to prevent the model from retaining outdated habits, such as using `sleep` + `pgrep`. With no third-party dependencies, the plugin uses behavior anchoring to help the model quickly switch to the correct background-job mode after gaining full capabilities.