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The 8 KB main bank is packed tightly enough that only ~280 bytes remained above
.bss, and interrupt frames overflowed into the topmost task stack - a hard fault
in cdc_msc_freertos. Put the MSP at the top of the 2 KB USB SRAM bank, which
nothing else uses in either build system, so the stack no longer shrinks as .bss
grows. The Make build's CFG_TUSB_MEM_SECTION placement of endpoint buffers into
that bank is dropped so both build systems agree on the layout.
The headroom assert is written as an addition rather than a subtraction, since
linker script arithmetic is unsigned and an overflowing bank would underflow the
difference into a huge positive value and pass silently.
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