v0.4.14: refresh MCP dependencies and lock the Python environment Refreshes the MCP stack and locks the Python dependency graph. - Upgraded the MCP SDK to 1.28.1 and Black to 26.3.1. Runtime and development images now install strictly from uv.lock. - Added a Streamable HTTP MCP contract test that initializes the mounted route, lists tools, and calls mailboxes through the application. - Fixed package update commands for exact pins and the dev group. - Aligned runtime, package, health example, and Codex plugin versions.