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1e3c104cbc
Addresses review feedback ("unsafe assumptions about memory layout",
"its a heuristic"). The patch_bk72xx_noinit.py extra_script now also
emits PROVIDE(_esphome_{ram,flash}_{start,end}) tied directly to the
linker's MEMORY definition. crash_handler.cpp consumes those symbols
instead of hardcoding bounds, so it tracks the actual variant + board
layout (BK7231N=192KB vs others=256KB, board-specific BKOFFSET_APP /
BKRBL_SIZE_APP) without any chip-aware constants of its own.
Mirrors the linker-symbol pattern already used in
components/esp8266/crash_handler.cpp for the IROM bounds.
