kaidokert / fixed-bigint-rs / 29652345767

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Add HeaplessBigInt operator parity (assign ops, BitXor, CheckedSub) (#144)

* Give HeaplessBigInt the ops it was missing vs FixedUInt

To behave like the same-width FixedUInt, HeaplessBigInt should carry the
same operator surface. Add the gaps found while unifying the test suites:

- AddAssign / SubAssign / MulAssign (owned + ref), delegating to the
  overflowing op + the Nct-panic/Ct-wrap rule the operators already use.
- BitXor (all four receiver forms, len = max like BitOr) and the three
  bitwise compound-assigns (BitAndAssign / BitOrAssign / BitXorAssign).
- CheckedSub (Nct-only, like CheckedAdd / CheckedMul), completing the
  checked add/sub/mul trio.

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