This commit addresses a bug where several agent definitions depended on non-existent template files.
- Restored `game-ux-expert.md` to its original state, re-instating its dependency on `game-ui-spec-tmpl.yaml`.
- Created the following four missing template files to satisfy agent dependencies:
- `game-ui-spec-tmpl.yaml`
- `level-design-doc-tmpl.yaml`
- `game-prd-tmpl.yaml`
- `game-qa-gate-tmpl.yaml`
An audit of all agent files has been completed to ensure that all template dependencies are now correct and point to existing files. The expansion pack is now fully consistent.