elfgzp/dsh-agent-team-playbook: Inject hard rules of Agent Teams into every session

elfgzp's unofficial DSH plugin registers a system prompt section `team-playbook:rules` (order 650) to inject six operational rules for each agent, enforcing constraints such as non-recyclable Agent Teams slots, prompt-scope writing (as opposed to locked), and teammates being fresh context—constraints not documented in the official README. This is a pure prompt injection solution that introduces no new tools or runtime changes. It is compatible with DSH versions >= 0.2.1-rc.3 < 0.3.0. Installation involves cloning from the local directory, running `pnpm install`, self-checking, and `install_bundle`, while avoiding silent failures like upper-level `pnpm-workspace.yaml` conflicts or deletion of the source directory.