dangernoodle-io / breadboard / 27072763044

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feat: report heap_internal, heap_psram, rtc memory in GET /api/info (#355)

adds three nested memory-region objects to the /api/info payload:
- heap_internal {free, total}: MALLOC_CAP_INTERNAL sram heap
- heap_psram {free, total}: MALLOC_CAP_SPIRAM; 0/0 on no-psram boards
- rtc {used, total}: rtc slow region (static, not a heap)
  - total = SOC_RTC_DATA_HIGH - SOC_RTC_DATA_LOW (8192 bytes on esp32-s3)
  - used = span of _rtc_data, _rtc_bss, _rtc_noinit, _rtc_force_slow linker sections

existing top-level free_heap and heap_minimum_ever fields are unchanged.
new bb_board accessors: bb_board_heap_internal_{free,total}, bb_board_psram_{free,total}, bb_board_rtc_{used,total}.
host stubs return 0/0. openapi response schema and fidelity tests updated.

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