bugfix: bound Delta Mode PIN reconstruction - #748
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Bound bootloader Delta Mode PIN reconstruction and fail closed on malformed PIN data. Removes the unnecessary terminator write and prevents the reverse walk from moving before the buffer.
This is a defense-in-depth correctness fix, not an exploitable security issue: supported PIN entry and trick-PIN provisioning cannot produce the malformed inputs needed to reach these bounds.
Validation: Mk4 and Q pins.o compile. No Python test applies because the simulator does not execute bootloader C.