chore: remove unnecessary debug logging

Frontend:
- Remove 4 console.log statements from terminal.tsx that flooded the
  browser console with WebSocket traffic (open, received X bytes, sending Y,
  xterm focused)

Backend:
- Downgrade Dockerfile/entrypoint compilation logs from INFO to DEBUG in
  _prepare_manifest_instance
- Remove hex-dump diagnostic logging from docker_build.py (was for
  troubleshooting the backslash continuation bug, now fixed)
- Downgrade Dockerfile write log from INFO to DEBUG

apps/web/src/components/terminal.tsx

@@ -107,7 +107,6 @@ export const TerminalComponent = React.forwardRef<TerminalRef, TerminalProps>(
 			wsRef.current = ws;
 
 			ws.onopen = () => {
-				console.log(`[Terminal ${sessionId ?? "default"}] WebSocket opened`);
 				setStatus("connected");
 				setError(null);
 				reconnectAttemptsRef.current = 0;
@@ -139,10 +138,6 @@ export const TerminalComponent = React.forwardRef<TerminalRef, TerminalProps>(
 				if (!termRef.current) return;
 
 				if (event.data instanceof Blob) {
-					// eslint-disable-next-line no-console
-					console.log(
-						`[Terminal ${sessionId ?? "default"}] received ${(event.data as Blob).size} bytes`,
-					);
 					event.data.arrayBuffer().then((buffer) => {
 						const data = new Uint8Array(buffer);
 						termRef.current?.write(data);
@@ -313,9 +308,6 @@ export const TerminalComponent = React.forwardRef<TerminalRef, TerminalProps>(
 			// Open xterm first (must happen before fit)
 			term.open(container);
 			term.focus();
-			console.log(
-				`[Terminal ${sessionId ?? "default"}] xterm opened and focused`,
-			);
 			const ws = connectWebSocket();
 
 			// Initial fit after layout settles (terminal must be opened first)
@@ -340,11 +332,6 @@ export const TerminalComponent = React.forwardRef<TerminalRef, TerminalProps>(
 
 			// Handle terminal input
 			term.onData((data) => {
-				// eslint-disable-next-line no-console
-				console.log(
-					`[Terminal ${sessionId ?? "default"}] sending:`,
-					JSON.stringify(data),
-				);
 				const currentWs = wsRef.current;
 				if (currentWs?.readyState !== WebSocket.OPEN) return;