- Extracted environment variable placeholder generation into helper function for test readability. - Refactored 9 test assertions to use envPlaceholder() helper instead of inline template strings.
* Add exact MCP OAuth redirect URI support * Allow proxied HTTPS loopback MCP redirects * Fix MCP OAuth busy-port test determinism * Make MCP OAuth redirect test deterministic * fix(coding-agent): honor exact loopback redirect ports * fix(coding-agent): expand env vars in standalone MCP oauth config --------- Co-authored-by: can1357 <me@can.ac>