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ParameterConverter: malformed current-request params in self-links return 4xx, not 500

Building a 'this'/self link re-validates the current request's own
(client-controlled) parameters via toParameters(). When such a value cannot be
coerced to the target action signature it now throws
InvalidRequestParameterException (a subtype of InvalidLinkException);
redirect()/redirectPermanent()/forward() degrade it to a BadRequestException
(4xx) and isLinkCurrent() to false, while link()/canonicalize() keep rendering
'#error'. Explicitly passed link arguments still throw plain InvalidLinkException,
preserving programmer-error detection.

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