Share constrained STM32 code while preserving firmware features

Omit unbound forwarding-region callbacks only for exclusive Companion source roles. Reuse the compact neighbor sorter in repeaters for every RPC order and the CLI list, removing duplicate sort implementations while preserving storage and size gates.

src/helpers/RadioProfileCLI.cpp

@@ -92,7 +92,7 @@ bool secondaryOverlaps(uint32_t primary_hz, float secondary_mhz, uint32_t cleara
   return (primary_hz > secondary_hz ? primary_hz - secondary_hz : secondary_hz - primary_hz)
          <= clearance_hz;
 }
-#if !defined(COMPANION_RADIO_FULL)
+#if !defined(COMPANION_RADIO_FULL) && !MESH_ROLE_COMPANION
 bool isMediaMeshProfile(const RadioProfileConfig& config) {
   return config.mode != RadioProfileMode::Off
       && config.params.freq >= 911.1495f && config.params.freq <= 911.1505f
@@ -102,7 +102,7 @@ bool isMediaMeshProfile(const RadioProfileConfig& config) {
 #endif
 }
 
-#if !defined(COMPANION_RADIO_FULL)
+#if !defined(COMPANION_RADIO_FULL) && !MESH_ROLE_COMPANION
 void RadioProfileCLI::setMediaMeshScopeHandler(MediaMeshScopeHandler handler, void* context) {
   media_scope_handler_ = handler;
   media_scope_context_ = context;

src/helpers/RadioProfileCLI.h

@@ -61,7 +61,7 @@ class RadioProfileCLI {
   // readable backup. Read/I/O failures and an intact backup remain read-only.
   bool recoverable_corrupt_store_ = false;
   bool publish_pending_ = false;
-#if !defined(COMPANION_RADIO_FULL)
+#if !defined(COMPANION_RADIO_FULL) && !MESH_ROLE_COMPANION
   MediaMeshScopeHandler media_scope_handler_ = nullptr;
   void* media_scope_context_ = nullptr;
   uint32_t media_scope_retry_ms_ = 0;
@@ -71,7 +71,7 @@ class RadioProfileCLI {
   void retryMediaMeshScope();
   bool mediaMeshScopePending() const { return media_scope_pending_; }
 #else
-  // Full Companions have no forwarding RegionMap. Do not retain unreachable
+  // Companions have no forwarding RegionMap. Do not retain unreachable
   // infrastructure callbacks, state or failure text in their tight images.
   bool mediaMeshScopeReady(const RadioProfileConfig&) const { return true; }
   void updateMediaMeshScope() {}
@@ -141,7 +141,7 @@ class RadioProfileCLI {
 #endif
   void begin(FILESYSTEM* fs, Radio* radio, RTCClock* rtc, bool infrastructure_replies = false);
   // Bind only after RegionMap::load(), so boot reconciliation is not discarded.
-#if !defined(COMPANION_RADIO_FULL)
+#if !defined(COMPANION_RADIO_FULL) && !MESH_ROLE_COMPANION
   void setMediaMeshScopeHandler(MediaMeshScopeHandler handler, void* context);
 #else
   void setMediaMeshScopeHandler(MediaMeshScopeHandler, void*) {}