stillwater-sc / universal / 23116994287

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feat(cfloat): implement parse() for string-to-cfloat conversion (#563)

Add parse() function that handles both cfloat hex format
(nbits.esxHEXVALUEc, with or without 0x prefix) and decimal
floating-point strings. Update operator>> to delegate to parse()
instead of directly casting through double.

The hex format matches hex_print() output (e.g. "16.5x0x3C00c")
and validates that nbits and es match the target configuration.
Decimal parsing rejects trailing junk for strict input validation.

Add parsing tests to cfloat api.cpp covering decimal, negative,
scientific notation, hex format (both with/without 0x prefix),
istream operator>>, trailing junk rejection, and config mismatch.

Resolves #339

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

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