fs.md gives the msize as 64 KiB, documents the Newcol refusal for tags that would not fit, and says how 16 columns is really reached

The docs said msize 8192, but the editor has offered 65536 since the bulk
write work. They also told a reader to reach 16 columns without saying it
needs a 160-cell window, or that Newcol halves the column it is run from.
The "the panes' tags would not fit" refusal was not documented at all.
The column paragraph now says all three, and that a refused Newcol logs
its err alone. docs/cloud9.md's options line gives the current numbers.

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

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