fs.md says a line held to the close reports its failure only as the log's err, and that a script needing the result ends its write with a newline

fs.md said an Edit block never ended "fails at the close" with
``unmatched `{'``, which reads as the close failing. The close reports no
error (round 24's decision: no clunk-time errors), and the write that sent
the block had already succeeded. The failure is only the log's err record.
The same holds for the tail of a 4096-multiple write that the close runs.
fs.md now says so, gives both err texts, and tells a script that needs a
line's result to end its write with a newline. tree.zig's "an Edit block
still open when its open closes fails there with an err and changes
nothing" is the test.

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

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