Fix Windows terminal background rendering and add /debug command

- Strip carriage return characters from bash tool output to fix background padding on Windows
- Add hidden /debug command to write rendered lines to debug log for TUI debugging
- Document /debug command in README.md development section

packages/coding-agent/src/tui/tool-execution.ts

@@ -83,8 +83,9 @@ export class ToolExecutionComponent extends Container {
 		const textBlocks = this.result.content?.filter((c: any) => c.type === "text") || [];
 		const imageBlocks = this.result.content?.filter((c: any) => c.type === "image") || [];
 
-		// Strip ANSI codes from raw output (bash may emit colors/formatting)
-		let output = textBlocks.map((c: any) => stripAnsi(c.text || "")).join("\n");
+		// Strip ANSI codes and carriage returns from raw output
+		// (bash may emit colors/formatting, and Windows may include \r)
+		let output = textBlocks.map((c: any) => stripAnsi(c.text || "").replace(/\r/g, "")).join("\n");
 
 		// Add indicator for images
 		if (imageBlocks.length > 0) {