Added docs/SOP-shared-resources.md covering:
- Single repo vs multi-repo directory structures
- Mounting strategies (copy, symlinks, git submodules, npm packages)
- What to share vs what to keep project-specific
- Referencing shared resources in tasks and prompts
- Versioning and update protocols
- Migration checklist
Updated GETTING-STARTED.md to reference the new prompt-registry templates.
Credit: BoardKit Orchestrator (Monika Voutov) for the shared resources pattern.
Closes#77
