Improve WebSocket handshake reading

- Fix WebSocket handshake response reading to wait for complete headers
- Increase buffer size for handshake response
- Add proper HTTP header completion detection
- Server still reports handshake issues but CLI connection improved

Status: Partial WebSocket implementation, needs further debugging

cli/src/net/ws.zig

@@ -138,9 +138,22 @@ pub const Client = struct {
 
         _ = try stream.write(request);
 
-        // Read response
-        var response_buf: [1024]u8 = undefined;
-        const bytes_read = try stream.read(&response_buf);
+        // Read response until complete
+        var response_buf: [4096]u8 = undefined;
+        var bytes_read: usize = 0;
+        var header_complete = false;
+
+        while (!header_complete and bytes_read < response_buf.len - 1) {
+            const chunk_bytes = try stream.read(response_buf[bytes_read..]);
+            if (chunk_bytes == 0) break;
+            bytes_read += chunk_bytes;
+
+            // Check if we have complete HTTP headers (\r\n\r\n)
+            if (std.mem.indexOf(u8, response_buf[0..bytes_read], "\r\n\r\n") != null) {
+                header_complete = true;
+            }
+        }
+
         const response = response_buf[0..bytes_read];
 
         // Check for successful handshake