[jamesarich]

Checklist

• PR title specifically describes the change
• tools/build_all.py (or CI's board matrix) passes

---

Description of Change

Another 368 B. main never returns, so newlib's startup and exit machinery is dead weight; Reset_Handler copies .data, clears exactly .bss (not .noinit) and calls main.

Tested on the same four boards as LTO, merged with the rest of 2.6: boots, self-update, UF2 install, INFO_UF2.TXT and BLE OTA all fine. __libc_fini_array stays linked through atexit; it never runs.

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[jamesarich]

Folded into #72.