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fe5088c6e1
Replace SmallBufferWithHeapFallback with a fixed stack buffer sized to the physical storage limit. No single preference can exceed the storage it resides in, so heap allocation is never needed. ESP8266: buffer sized to max(flash_storage, rtc_normal_region) — 128 words (512B) with restore_from_flash, 96 words (384B) without. RP2040: buffer sized to flash storage (512B). Eliminates new[]/delete[] codegen from save()/load() virtual methods.
