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custom_sdkconfig makes pioarduino regenerate the ESP-IDF libraries: asymmetric TLS buffers (16 KB in, 4 KB out) and dynamic buffers that free handshake-only data once connected. The rebuild also follows the board: no PSRAM, 8 MB flash. The project now carries the partition table the hybrid build needs (identical to the framework's: the app slots must not move under updates over the air). Generated files are ignored. Debug Build, GNSS on, IRC on TLS: 78 KB free and a 59 KB low (M2 began at 31 KB and 12.6 KB; the floor is 40 KB). The full stress set passes on it: refused installs over Wi-Fi and from SD, put/get, screenshot, core dump decode, Probation; under all of it at once, the low is 46 KB. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01EhqxQ49eCju4CzKYNjZzwT