fix(L9): don't starve the keypad during import/format waits

main.c

@@ -52,7 +52,7 @@ static void boot_network(void) {
     printf("[main] NTP sync ok\r\n");
 }
 
-static void core0_handle_door_verify(void) {
+void core0_handle_door_verify(void) {
     static uint32_t last_handled_seq = 0;
 
     uint32_t seq = door_verify_mailbox.request_seq;

serial/commands_backup.c

@@ -3,6 +3,7 @@
 #include "storage/backup.h"
 #include "shared/wipe.h"
 #include "libs/base64/base64.h"
+#include "shared/door_verify.h"
 #include "pico/stdlib.h"
 #include "pico/time.h"
 #include <stdio.h>
@@ -83,6 +84,10 @@ void cmd_import_keys(int argc, char **argv) {
     absolute_time_t deadline = make_timeout_time_ms(60000); // 60s to paste
 
     while (!time_reached(deadline)) {
+        // Core 0 is the only servicer of keypad door-verify requests; pump it
+        // each iteration so a long paste never starves the keypad (L9).
+        core0_handle_door_verify();
+
         int c = getchar_timeout_us(10000);
         if (c == PICO_ERROR_TIMEOUT)
             continue;

serial/commands_system.c

@@ -10,6 +10,7 @@
 #include "network/ntp.h"
 #include "storage/backup.h"
 #include "storage/storage.h"
+#include "shared/door_verify.h"
 #include "shared/totp.h"
 #include "shared/wipe.h"
 #include "version.h"
@@ -64,11 +65,13 @@ void cmd_status(int argc, char **argv) {
         printf("ntp:       not synced\r\n");
     }
 
-    // Keys (admin only: key inventory is target-selection data)
+    // Keys (admin only: key inventory is target-selection data). Declared at
+    // function scope so the scrub below always runs, even on the non-admin path
+    // where the array stays zero-initialised.
+    static key_record_t keys[BACKUP_MAX_KEYS];
     if (commands_is_admin()) {
-        static key_record_t keys[BACKUP_MAX_KEYS];
-        int                 count   = storage_key_list(keys, BACKUP_MAX_KEYS);
-        int                 enabled = 0, corrupt = 0;
+        int count   = storage_key_list(keys, BACKUP_MAX_KEYS);
+        int enabled = 0, corrupt = 0;
         for (int i = 0; i < count; i++) {
             if (!keys[i].is_checksum_valid)
                 corrupt++;
@@ -252,6 +255,10 @@ void cmd_format_storage(int argc, char **argv) {
     absolute_time_t deadline    = make_timeout_time_ms(15000);
 
     while (!time_reached(deadline) && len < 7) {
+        // Core 0 is the only servicer of keypad door-verify requests; pump it
+        // each iteration so the confirm wait never starves the keypad (L9).
+        core0_handle_door_verify();
+
         int c = getchar_timeout_us(0);
         if (c == PICO_ERROR_TIMEOUT) {
             sleep_ms(10);

shared/door_verify.h

@@ -35,4 +35,11 @@ typedef struct {
 
 extern door_verify_mailbox_t door_verify_mailbox;
 
+// Core-0 servicer of the mailbox: reads a pending keypad request (if any) and
+// writes back the verdict. Non-blocking and single-shot per request. Defined in
+// main.c and normally called once per core-0 main-loop iteration; also pumped
+// inside core-0 blocking loops (import/format waits) so a paste/confirm can
+// never starve the keypad (ISSUES.md L9).
+void core0_handle_door_verify(void);
+
 #endif