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MAINT-010 and MAINT-016, the two high items the review left open. Both were re-probed
before the change and the new test is red on HEAD (5 passed, 7 FAILED).
- virtual-fs.js rename()/copy(): they assigned dst.dir.content[dst.name] with no destination
type check, so `mv file /docs` replaced the /docs node and every child vanished while the
command printed "Moved: …". Refuse when the destination is a real directory node (the
virtual /sys entry is exempt). rename() also erased the file on `mv a a`, because assigning
and then deleting the same key removes it; that path is now an explicit no-op.
- module-fs.js mv/cp: a refusal used to surface as "No such file or directory", which sent
the operator looking for a missing source. The destination is now inspected first and the
message says "is a directory — refusing to overwrite it".
- module-fs.js ls: the path was only read from argv[0], so `ls -l /work` listed the cwd.
The first non-flag argument is now the target; the path-first form is unchanged.
Tests: modules/test/test-fs-mv-cp-guard.js (12 asserts) — RED on HEAD (A1-A3, B1, B2, C2, E1),
GREEN now; maintain --fix reports "node tests 7/7 pass". Browser on v4.6.104:
"mv: /vtest: is a directory — refusing to overwrite it", child and source intact,
"ls -l /vtest" lists /vtest (keep.txt), not the cwd.
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