config selector: scale maxVisible to terminal height

ResourceList hardcoded maxVisible=15, leaving most of the screen
empty on tall terminals. Pass terminalHeight through from
ProcessTerminal.rows and compute maxVisible dynamically, matching
the pattern tree-selector already uses.

Closes #4241

packages/coding-agent/src/cli/config-selector.ts

@@ -43,6 +43,7 @@ export async function selectConfig(options: ConfigSelectorOptions): Promise<void
 				process.exit(0);
 			},
 			() => ui.requestRender(),
+			ui.terminal.rows,
 		);
 
 		ui.addChild(selector);