Restore lost ShellCore hooks after resume and before registration

Validate the existing bridge and original target bytes before repairing lost hooks in a stopped ShellCore. Retain rollback ownership on partial failures, support process replacement, and disable recovery when stopping. Check once after resume and on registration without adding polling or scanner deadlines. Refs #145, #147; adapts the recovery approaches from PR #148 and #126.

include/sm_shellcore_hooks.h

@@ -7,6 +7,9 @@
 bool sm_shellcore_hooks_start(void);
 void sm_shellcore_hooks_stop(void);
 
+// Check/repair previously installed hooks; disabled hooks remain disabled.
+bool sm_shellcore_hooks_refresh(void);
+
 // Return whether this firmware uses the internal TitleDir bridge.
 bool sm_shellcore_install_bridge_enabled(void);