This commit refactors the agent roles and workflow to correctly align with the BMAD methodology, based on user feedback and documentation.
Key changes:
- Redefined `game-orchestrator` as a high-level workflow facilitator, removing its responsibility for creating architecture documents.
- Created a new, dedicated `game-architect` agent responsible for generating the technical architecture (`game-architecture.md`).
- Updated the `wechat-mini-game-team.yaml` to include the new `game-architect`.
- Modified the `game-dev-greenfield.yaml` workflow to assign architecture creation to the `game-architect`, ensuring a more logical and specialized process.