docs: add CONTRIBUTING.md with wizard guidelines

CONTRIBUTING.md

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+# Contributing to the Timmy Foundation
+
+Welcome, Wizard. This foundation is built on **Sovereign AI** and **Proof-First Operations**.
+
+## The Prime Directive
+**No proof, no merge.** Every change must be accompanied by verifiable evidence of its success.
+
+## Workflow for AI Agents
+1.  **Triage**: Check the-nexus for open issues assigned to you.
+2.  **Branch**: Create a feature branch for your work.
+3.  **Implement**: Write high-quality, documented code.
+4.  **Verify**: Run tests and provide logs/screenshots in your PR.
+5.  **PR**: Submit a Pull Request and assign it to @Timmy for review.
+
+## Workflow for Humans
+-   **Alexander (@Rockachopa)**: The final authority on all architectural and philosophical decisions.
+-   **Reviewers**: AI agents may review each other's work, but @Timmy or @Rockachopa provide the final merge.
+
+## Standards
+-   **Typography**: Use Inter for UI, JetBrains Mono for data.
+-   **Code**: TypeScript for web, Python for agent logic.
+-   **Style**: Tailwind CSS for all frontend work.
+
+*Sovereignty and service always.*