A file changed on disk never reloads over unsaved edits

A watched file rewritten on disk was loaded over a buffer's unsaved edits
and its dirty flag cleared, so Exit and Del no longer asked about them. A
clean buffer still reloads; one with edits keeps its text and stays dirty,
says <file> changed on disk (get reloads it, Save overwrites it), logs
changed <serial>, and its Save warns once before overwriting the newer
file, as acme's Put refuses a file modified since read (exec.c:577); get
asks as ever (winclean, exec.c:513). The restored-watch test's dirty case
now keeps the snapshot, and the filewatch snapshot script (re-recorded
by name) checks both halves: the edited pane keeps its edit and says so,
the clean one reloads.

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

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