app-module events & callstack config, crash diagnostics (#630)

- Apps can specify task stack depth and preferred memory placement in their manifests.
- App identifiers are validated against length and character requirements.
- Crash diagnostics now show the crash cause, reason, fault address, call stack, and program-counter details, with logs saved for review.
- App closing is more consistent across built-in screens. There's now a dedicated function, and the old _emit() function is made private.
- Crash diagnostics no longer display a QR code without a call stack.
- Improved memory allocation for unrestricted requests.

Modules/app-module/include/app/event.h

@@ -114,16 +114,6 @@ error_t app_event_subscribe_with_app_id(struct AppEventSubscription* sub, struct
  */
 error_t app_event_unsubscribe(struct AppEventSubscription* sub);
 
-/**
- * Deliver @a event to every subscription registered for @a app_instance_id (normally exactly one).
- * @warning Does not work in ISR context.
- * @retval ERROR_NONE delivered to at least one subscription
- * @retval ERROR_NOT_FOUND no subscription is registered for @a app_instance_id
- * @retval ERROR_RESOURCE at least one matching subscription's queue was full; the event was
- * dropped for that subscription (still delivered to any other matching subscription)
- */
-error_t app_event_emit(AppInstanceId app_instance_id, const struct AppEvent* event);
-
 /**
  * Non-blocking: pop the next event for @a sub if one is already queued.
  * @warning Never blocks. To wait for an event, block in task_event_group_wait()/
@@ -134,6 +124,13 @@ error_t app_event_emit(AppInstanceId app_instance_id, const struct AppEvent* eve
  */
 error_t app_event_poll(struct AppEventSubscription* sub, struct AppEvent* out_event);
 
+/**
+ * Emits a close event to the specified app.
+ * @param[in] instance_id
+ * @return ERROR_NONE when event was successfully emitted
+ */
+error_t app_event_emit_close(AppInstanceId instance_id);
+
 #ifdef __cplusplus
 }
 #endif