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>

PROMPT_build.md

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+# Build Mode Instructions
+
+You are implementing CheapRetouch, an iOS photo editor for removing unwanted elements.
+
+## Your Task
+
+1. Read `.specify/memory/constitution.md` for project guidelines
+2. Find the next incomplete spec in `specs/`
+3. Implement it fully, following all acceptance criteria
+4. Run tests to verify completion
+5. Commit and push (Git Autonomy is enabled)
+6. Output `<promise>DONE</promise>` when the spec is 100% complete
+
+## Implementation Guidelines
+
+- Follow the project structure in `project-specifications.txt`
+- Implement primary detection path first, then fallbacks
+- Handle all edge cases specified
+- Write tests as required (unit, snapshot, UI, performance)
+- Keep memory under 1.5GB budget
+- Ensure preview renders < 300ms on A14 baseline
+
+## Do Not
+
+- Add ML models or neural networks
+- Add features marked as out of scope
+- Make network calls for core functionality
+- Output `<promise>DONE</promise>` until truly complete