Qualify Full Meshtext builds and share cold storage on constrained companions

src/helpers/ESPNowRawFragmentation.h

@@ -152,10 +152,10 @@ class ESPNowRawReassemblerT {
  public:
   static_assert(SlotCount > 0, "ESP-NOW reassembly needs at least one slot");
 
-  explicit ESPNowRawReassemblerT(uint32_t timeout_ms = 2000)
-      : _timeout_ms(timeout_ms) {
-    reset();
-  }
+  // Constant initialization also lets the linker discard the primary-radio
+  // workspace when this shared source is compiled into a LoRa-only image.
+  explicit constexpr ESPNowRawReassemblerT(uint32_t timeout_ms = 2000)
+      : _timeout_ms(timeout_ms), _slots{} {}
 
   void reset() {
     memset(_slots, 0, sizeof(_slots));

src/helpers/ota/OtaMemoryPolicy.h

@@ -24,6 +24,9 @@
 
 // Qualified Full Companions stream host-provided firmware and need no permanent
 // mOTA workspace. Apply the same policy to build.sh and direct PlatformIO builds.
+// Other qualified recipes, including the constrained ESP32 224-frame queue, opt in through
+// OTA_SHARED_COMPANION_QUEUE. The queue checks the complete context size against
+// its actual upper region and retains the same 128 frames during explicit OTA.
 #if defined(OTA_SEEDER_ONLY) && defined(COMPANION_RADIO_FULL) && \
     (defined(NRF52_PLATFORM) || \
      (defined(ESP32_PLATFORM) && defined(HELTEC_WIRELESS_PAPER)))