reject digit separator inside hex-float exponents - #302
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Repro: with a digit separator set and ALLOW_HEX_FLOATS, "0x1p1_0" parses to 1024 and "0x1.8p1_0" to 1536; both should be junk.
Cause: IsHexFloatString and RadixStringToIeee advance through the hex-float exponent with the active separator, so a separator between two exponent digits is consumed. The decimal exponent uses a plain increment and already rejects "1e1_0".
Fix: advance through the hex-float exponent with kNoSeparator in both the validator and the parser, matching the documented rule that the separator is only allowed between significand digits. Significand separators and valid hex-floats are unchanged; a regression test sits beside the existing separator cases.