docs: set the decode-failure policy through the subscriber clause - #208
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The decode-failures example in the codecs guide built a handler by hand (typed(codec, ..) + on_decode_failure + b.handle) where the subscriber macro's on_failure(decode = ..) clause is the user-facing form. The snippet now shows the clause; the hand-built path stays as a one-line mention. The example compiles and runs as before.