Edit's w and the other left-out sam commands fail EIO in words, never EOPNOTSUPP, and /os refuses a rename or a chmod as not permitted, EACCES

"w is not supported in pardes" read through a mount as EOPNOTSUPP, as
if the file system lacked an operation, and a chmod under /os was
answered "invalid truncate", EINVAL. An Edit command pardes leaves out
now says so in words 9ns reads as EIO, and a rename or mode change of
an /os file is "permission denied", EACCES. fs.md's Failure section and
/os entry say both.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

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