fix(classify): mq_timedsend returns status, not bytes — make ret UNCLASSIFIED

mq_timedsend(2)/mq_send(3) return 0 on success or -1 on error; the
payload size msg_len is an INPUT argument, never the return value. It was
wrongly listed in retClassifications as WriteClassified, which made
bytesFromRet attribute its 0 return as "bytes written" (the stats engine
WriteClassified path). Remove it so its return stays UNCLASSIFIED,
consistent with its POSIX mq sibling mq_timedreceive (which legitimately
stays ReadClassified because it returns the received byte count). This is
the exact same defect just fixed for SysV msgsnd (5057bd9) and mirrors
the msgrcv/msgsnd asymmetry.

Regenerated tracepoints/docs accordingly and updated the pre-existing
classify unit test and the TestPosixMqBasic integration assertion: the
mq_timedsend send no longer asserts a write byte count (now expects 0),
while mq_timedreceive keeps its received-byte-count assertion. Verified:
mage generate idempotent, mage build OK, internal/generate tests pass.
TestPosixMqBasic skips in this sandbox (mq_open: permission denied) but
compiles with the corrected assertions.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

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