test(copy_file_range): assert TRANSFER_CLASSIFIED copied byte count end-to-end

TestCopyFileRangeBasic previously asserted only the enter event and source
path (copyrangesrc.txt) but not the copied byte count on the
TRANSFER_CLASSIFIED exit, unlike sibling sendfile64/splice/tee coverage in
retbytes_test.go. The basic scenario copies exactly the 32-byte payload
"copy_file_range integration data" in a single copy_file_range(2) call, so
the exit byte count is deterministic.

Switch to runScenarioResult and add assertEventBytesEqual(...,32) plus
assertEventDurationPositive to lock in the transfer attribution (FamilyFS,
fd_in@args[0], ret TransferClassified). Coverage hardening only; no defect.

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

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