Add CITATION.cff and SECURITY.md

Author: patrickliu0077

CITATION.cff

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+cff-version: 1.2.0
+message: "If you use SimpleFunctions in your research, please cite it as below."
+type: software
+title: "SimpleFunctions"
+abstract: "Context flow infrastructure for prediction markets. Thesis management, causal tree decomposition, edge detection, and automated trading across Kalshi and Polymarket."
+authors:
+  - family-names: Liu
+    given-names: Patrick
+url: "https://simplefunctions.dev"
+repository-code: "https://github.com/spfunctions/simplefunctions-cli"
+license: MIT
+version: "1.5.0"
+date-released: "2026-01-01"
+keywords:
+  - prediction-markets
+  - kalshi
+  - polymarket
+  - ai-agents
+  - mcp
+  - causal-inference
+  - edge-detection

SECURITY.md

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+# Security Policy
+
+## Reporting a Vulnerability
+
+If you discover a security vulnerability in SimpleFunctions, please report it responsibly.
+
+**Email:** patrick@simplefunctions.dev
+
+Please include:
+- Description of the vulnerability
+- Steps to reproduce
+- Potential impact
+
+We will acknowledge your report within 48 hours and aim to release a fix within 7 days for critical issues.
+
+## Scope
+
+- SimpleFunctions CLI (`@spfunctions/cli`)
+- SimpleFunctions REST API (`simplefunctions.dev/api/*`)
+- SimpleFunctions MCP Server (`simplefunctions.dev/api/mcp/mcp`)
+
+## Out of Scope
+
+- Third-party exchange APIs (Kalshi, Polymarket)
+- User-generated thesis content