James L 990649d810 Fix heap exhaustion: enable PSRAM allocator + bound all tables + auto-reboot watchdog ...

Root cause: heltec_V4_boundary build was missing -DRNS_USE_TLSF=1 and
-DRNS_USE_ALLOCATOR=1 flags, causing ALL C++ new/delete to use internal
SRAM (239KB) instead of the PSRAM-backed TLSF pool (~1.6MB). Transport
data structures consumed internal heap until WiFi driver could not
allocate RX buffers (ESP_ERR_NO_MEM).

Changes:
- platformio.ini: Add TLSF/allocator flags to heltec_V4_boundary env,
  re-enable NDEBUG
- Transport.cpp: Add periodic culling of _path_requests (was unbounded,
  grew one entry per unique destination forever). Cull entries older than
  DESTINATION_TIMEOUT. Also cull _pending_local_path_requests for removed
  interfaces, and fix missing .erase() (Python .pop() equivalent).
- RNode_Firmware.ino: Replace WiFi watchdog halt-serial with auto-reboot.
  Add heap pressure check (reboot if free heap < 20KB). Increase WiFi
  grace period from 5s to 15s. Remove orphaned boundary_done label.

2026-02-25 13:48:10 -05:00

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