docs: note that sun_t passes a NaN timestamp through

NaN is a number, so the type guard admits it, and every comparison
against NaN is false, so neither clamp catches it and the function
returns NaN.

Left unguarded on purpose. No caller can produce it: parse() matches
%d+ for the sun times and `now` is os.time(). If one ever did, Cairo
ignores a NaN coordinate, so the arc would lose its dot rather than the
dashboard going blank. A ponytail: comment names the ceiling and where
the guard would go.

Found while probing the committed code, not by the tests, which do not
cover NaN.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

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