[parse] Reject unexpected punctuation in color function arguments

[ScribleSean]

Fixes #614.

color(--lchuv 86.8% 42.9)230) currently parses successfully because argument extraction silently discards unmatched punctuation. Reject the function when unmatched content contains anything other than commas or whitespace.

Adds 19 invalid-input regressions and four valid-input controls, including alpha, scientific notation, none, and calc(NaN). Also removes an extra closing parenthesis in an existing gamut test's expected value, exposed by the stricter parser. This change is limited to unconsumed punctuation; it does not attempt full CSS grammar validation.

Validation on base 19eb89f8995d2139436b6d38c7042944bb23a718:

• All 19 new rejection cases fail before the source fix and pass afterward.
• Full suite: 817 passed, 72 existing skipped, zero failures.
• Full build, changed-file ESLint, parser/test formatting and diff whitespace checks pass. The gamut file retains an unrelated pre-existing formatting warning.

Prepared with OpenAI Codex assistance using GPT-6 Astra (gpt-6-astra), medium reasoning. I review all contributions before submission and remain responsible for the code and this message. The commit includes Codex co-author attribution.

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