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* 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.