A first SIGINT or SIGTERM cancels the scan. It commits the hashed
records still in its batch, with a context that is not cancelled for
that one write, and starts no other write or deletion; deletions need
a complete walk, so records under paths an interrupted walk never
reached are kept. A batch whose commit failed is now kept for that
final commit instead of dropped. The progress display is finished (a
bar stopped short is no longer filled up), `scan: interrupted after N
files` goes to stderr, and the exit code is 1. A second signal ends the
process at once. A SIGINT inherited as ignored stays ignored.
Model: opus-5-5
When stderr is not a terminal, each phase prints its zero-state line
as it starts instead of after its first item. stderrIsTTY uses
term.IsTerminal from golang.org/x/term, now a direct dependency, so
/dev/null is no longer taken for a terminal.
A spinner keeps the library's background redraw, so its count and
elapsed time stay current while a phase waits for its next item. A
warning printed during a spinner phase goes through the bar
(progressbar.Bprintln), which prints it before its next redraw instead
of racing it. Bars with a total have no background redraw and still
print warnings directly.
Model: opus-5-5
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