Add MemAudit: per-subsystem heap accounting in the boot log (#10900)

* Add MemAudit: per-subsystem heap accounting in the boot log

The 2.8.0 nRF52840 heap-exhaustion field reports had to be diagnosed by
hand, reconstructing each subsystem's heap footprint from source and
build flags one report at a time. This makes every future report
self-diagnosing from the serial log: a tiny fixed-size registry
(src/memory/MemAudit.*) that big long-lived allocations report into,
printed as one line at the end of setup() and alongside the periodic
"Heap free:" log:

  MemAudit[boot]: tmm=2500 warm=4000 pkthist=5824 nodedb=13440
  msgstore=2200 pktpool(live)=3270 total=31234

Instrumented: NodeDB hot vector (nodedb) + satellite maps (satmaps,
rb-tree overhead estimated), WarmNodeStore (warm), PacketHistory records
and hash index (pkthist), TrafficManagement caches (tmm/tmm_ni),
MessageStore text pool (msgstore), TFT line/repaint buffers (display),
and live in-flight packets (pktpool(live)) via an optional audit tag on
the packet pool allocator - the one hot path, counted with a relaxed
32-bit atomic add (single instructions on Cortex-M, no locks).

Cost: 128 B RAM for the 16-tag table, well under 1 KB flash on rak4631.
MESHTASTIC_MEM_AUDIT=0 compiles it out to inline no-op stubs (call
sites need no ifdefs); STM32WL, the tightest flash target, defaults off.

New native suite test_mem_audit covers add/set/snapshot arithmetic, tag
reuse (pointer and cross-TU strcmp fallback), null/unknown tags, and
table-full behavior; test/native-suite-count bumped to 28.

* native-wasm: add src/memory/ to the curated source filter

The wasm env denies all sources and adds an explicit file list; MemAudit
callers (main, MeshService, NodeDB, PacketHistory) are in that list but
src/memory/MemAudit.cpp was not, so wasm-ld failed on undefined
memaudit:: symbols.

src/modules/TrafficManagementModule.cpp

@@ -12,6 +12,7 @@
 #include "airtime.h"
 #include "concurrency/LockGuard.h"
 #include "configuration.h"
+#include "memory/MemAudit.h"
 #include "mesh-pb-constants.h"
 #include "meshUtils.h"
 #include <Arduino.h>
@@ -163,6 +164,7 @@ TrafficManagementModule::TrafficManagementModule() : MeshModule("TrafficManageme
     cache = new UnifiedCacheEntry[allocSize]();
 #endif
 
+    memaudit::set("tmm", cache ? allocSize * sizeof(UnifiedCacheEntry) : 0);
 #endif // TRAFFIC_MANAGEMENT_CACHE_SIZE > 0
 
 #if defined(ARCH_ESP32) && defined(BOARD_HAS_PSRAM)
@@ -177,6 +179,7 @@ TrafficManagementModule::TrafficManagementModule() : MeshModule("TrafficManageme
     } else {
         TM_LOG_WARN("NodeInfo PSRAM payload allocation failed; direct responses will fall back to NodeDB");
     }
+    memaudit::set("tmm_ni", nodeInfoPayload ? nodeInfoTargetEntries() * sizeof(NodeInfoPayloadEntry) : 0);
 #else
     TM_LOG_DEBUG("NodeInfo PSRAM cache not available on this target");
 #endif
@@ -198,6 +201,7 @@ TrafficManagementModule::~TrafficManagementModule()
             delete[] cache;
         cache = nullptr;
     }
+    memaudit::set("tmm", 0);
 #endif
 
     if (nodeInfoPayload) {
@@ -207,6 +211,7 @@ TrafficManagementModule::~TrafficManagementModule()
             delete[] nodeInfoPayload;
         nodeInfoPayload = nullptr;
     }
+    memaudit::set("tmm_ni", 0);
 }
 
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