chore: update MCPG_VERSION to 0.2.18 (#161)

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: github-actions[bot]

src/compile/common.rs

@@ -502,7 +502,7 @@ pub fn generate_header_comment(input_path: &std::path::Path) -> String {
 /// Docker image and version for the MCP Gateway (gh-aw-mcpg).
 /// Update this when upgrading to a new MCPG release.
 /// See: https://github.com/github/gh-aw-mcpg/releases
-pub const MCPG_VERSION: &str = "0.2.17";
+pub const MCPG_VERSION: &str = "0.2.18";
 
 /// Default port MCPG listens on inside the container (host network mode).
 pub const MCPG_PORT: u16 = 80;