Hojun-Cho 46ed712352 lib/math+encoding: restore Hare loud preconditions (F-Q) ...

Three lib functions had lost their Hare loud-abort preconditions, so an
out-of-domain argument silently returned garbage instead of aborting:

  random.u32n / random.u64n  assert(n != 0)    ref/hare/math/random/random.ha:26,42
  base64.decodedsize         assert(sz%4 == 0) ref/hare/encoding/base64/base64.ha:597

Source-bundled lib change, identical on both stages (byte-id neutral).
989_libprecond_abort pins each precondition: n=0 / sz%4!=0 abort (rc!=0),
valid args return 0, run on cstage and wwstage.

2026-06-14 23:22:51 +09:00

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