Add Ralph Wiggum agent setup and project specifications

- Add project constitution with vision, principles, and autonomy settings
- Add 15 feature specifications covering full app scope
- Configure agent entry points (AGENTS.md, CLAUDE.md)
- Add build prompt and speckit command for spec creation
- Include comprehensive .gitignore for iOS development

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

AGENTS.md

@@ -0,0 +1,18 @@
+# Agent Instructions
+
+Read and follow the constitution at `.specify/memory/constitution.md` for all project guidelines, principles, and technical decisions.
+
+## Quick Reference
+
+- **Project**: CheapRetouch - iOS photo editor for removing unwanted elements
+- **Platform**: iOS 17.0+
+- **Stack**: SwiftUI, Vision, VisionKit, Metal, Core Image
+- **YOLO Mode**: Enabled
+- **Git Autonomy**: Enabled
+
+## Workflow
+
+1. Check `specs/` for incomplete specifications
+2. Implement each spec fully before moving to the next
+3. Commit and push when spec is complete
+4. Output `<promise>DONE</promise>` only when 100% complete