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* ESP8266: fix ESP_getMaxAllocHeap() and ESP_getHeapFragmentation()
Both functions returned wrong values: ESP_getMaxAllocHeap() returned
ESP.getFreeHeap() (total free, not largest contiguous block);
ESP_getHeapFragmentation() read ummHeapInfo.maxFreeContiguousBlocks,
which is only valid immediately after a umm_info() heap walk.
Fix: cache the result of umm_max_block_size() in ESP_UpdateHeapMetrics().
The cache is refreshed once per second when SetOption130 is active, and
on demand in CmndStatus() before Status 4 is output. Both getter functions
read the cached value; the call site overhead is a single integer read.
umm_max_block_size() is unconditionally available (UMM_INFO is hardcoded
in the Arduino ESP8266 umm_malloc_cfg.h), so no build flags are required.
Status 4 (StatusMEM) gains two ESP8266-specific fields: MaxFreeBlock (KB)
and Frag (%).
* ESP8266: add heap OOM diagnostics, Status 4 fields, Status 44 dump
OOM event monitoring (requires UMM_INLINE_METRICS or UMM_STATS_FULL):
- ESP_HeapOomCheck(): called once per second; logs the OOM counter delta
when the counter changes ("OOM: count N (+M)")
- ESP_HeapOomTest(): logs current OOM count on demand
Status 4 (StatusMEM) gains additional ESP8266-specific fields when the
corresponding build flags are active:
- OomCount: cumulative out-of-memory events (UMM_INLINE_METRICS or
UMM_STATS_FULL)
- HeapLwm (KB): heap low-watermark since boot (UMM_STATS_FULL)
- MaxAllocSz (bytes): peak single allocation size (UMM_STATS_FULL)
Status 44 (ESP8266-only diagnostic command):
- Triggers umm_info(nullptr, true) to print a full heap block map to
the serial console
- Calls ESP_HeapOomTest() to log the current OOM count
- Returns {"Status44":{"HeapDump":"serial"}}
- Status 44 is accepted regardless of MAX_STATUS
Build flags UMM_STATS_FULL and UMM_INLINE_METRICS can be enabled via
platformio_override.ini build_flags; documented in
platformio_override_sample.ini.