Fix Full Companion terminal diagnostics

src/helpers/CompanionTerminalDiagnostics.h

@@ -0,0 +1,39 @@
+#pragma once
+
+#include <stddef.h>
+#include <stdint.h>
+#include <stdio.h>
+
+namespace mesh {
+
+struct CompanionMemoryDiagnostics {
+  uint32_t heap_free;
+  uint32_t heap_min;
+  uint32_t heap_max_alloc;
+  uint32_t internal_free;
+  uint32_t internal_max_alloc;
+  uint32_t psram_free;
+  uint32_t psram_total;
+  int queue_used;
+  int queue_capacity;
+};
+
+inline bool formatCompanionMemoryDiagnostics(
+    char* output, size_t output_size,
+    const CompanionMemoryDiagnostics& diagnostics) {
+  if (output == nullptr || output_size == 0) return false;
+  const int written = snprintf(
+      output, output_size,
+      "Heap free=%lu min=%lu max=%lu int=%lu/%lu PSRAM=%lu/%lu queue=%d/%d",
+      (unsigned long)diagnostics.heap_free,
+      (unsigned long)diagnostics.heap_min,
+      (unsigned long)diagnostics.heap_max_alloc,
+      (unsigned long)diagnostics.internal_free,
+      (unsigned long)diagnostics.internal_max_alloc,
+      (unsigned long)diagnostics.psram_free,
+      (unsigned long)diagnostics.psram_total,
+      diagnostics.queue_used, diagnostics.queue_capacity);
+  return written >= 0 && static_cast<size_t>(written) < output_size;
+}
+
+}  // namespace mesh