Harden SSH Admission And Credential Input

src/console_input.h

@@ -8,6 +8,10 @@
 
 #include "esp_err.h"
 
+/* Hidden input accepts printable ASCII with CR/LF submit, BS/DEL editing and
+ * Ctrl-C cancellation. Overflow or any other byte rejects the entire prompt on
+ * submit (ESP_ERR_INVALID_SIZE), even after editing; rejected input is wiped.
+ * capacity includes the trailing NUL. Visible line editing is unchanged. */
 esp_err_t console_input_read_hidden(const char *prompt,
                                     uint8_t *output, size_t capacity,
                                     size_t minimum_length, size_t maximum_length,