* fix: degrade unparseable clone VERSION/SEQNO instead of erroring (#95)

parseClone routed both tokens through strconv.Atoi before the §8.1 digit-only rule ever got a chance to apply, so a token Atoi could not parse at all (not just one that fails digit-only) hard-errored the whole message instead of degrading gracefully. Carry the raw tokens forward as an UnknownCard on parse failure, matching how UnknownCard already handles a non-decimal clone_seqno, so a later card in the same message still decodes.

* fix: reject an oversized §4.1 declared length before trying raw zlib (#110)

xfer.Decode tried the unprefixed-zlib framing before ever reading the §4.1 container's declared length prefix. A peer declaring a length at or above 0x08000000 produces a prefix whose first two bytes present as a structurally valid zlib CMF/FLG header (RFC 1950), so a large declared length aliases as the start of a raw zlib stream and gets first refusal on a legitimate compressed container. Read the declared length whenever the body opens with a valid zlib header and reject it against MaxDecompressedBytes before attempting format 1 at all. check-in: 2b9694f525 user: [email protected] tags: trunk