docs: add project architecture and planning documents

context/project-context.md

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+# Project Context
+
+Project Name:
+ChatGPT MCP
+
+Purpose:
+
+Allow Claude Code to query ChatGPT through MCP tools.
+
+Primary Use Cases:
+
+- Architecture review
+- Plan review
+- Code review
+- Debugging assistance
+- Risk identification
+- Task decomposition
+
+Non-Goals:
+
+- Autonomous coding
+- Source control management
+- Deployment automation
+- Replacing Claude Code
+
+Success Criteria:
+
+Claude Code can invoke MCP tools and receive useful second-opinion responses from ChatGPT.