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Preserve Git-quoted filenames when running all hooks (#924)

With Git path quoting enabled, `overcommit --run` treats escaped `git
ls-files` output as filenames. Unicode, quoted, and control-character
paths fail include filters, allowing violations to pass unchecked.
Request NUL-delimited output for both tracked and deleted files and
split on NUL, preserving the actual filenames and the existing deletion
filtering.

Fixes #908.

Reproduced locally before the fix: five CLI cases (Unicode, nested
Unicode, quotes, tabs, and newlines) incorrectly exited 0 despite
trailing whitespace. Regression coverage also checks spaces and
surrounding whitespace, deleted Unicode and control-character paths, and
a tracked broken symlink. Filesystem-invalid Windows names are tested on
Unix; Windows runs the Unicode cases and existing enumeration controls.

Validation: full local RSpec suite (1,728 examples); RuboCop on changed
Ruby files. The PR runs the full Linux/Windows CI matrix.

2 of 2 new or added lines in 1 file covered. (100.0%)

3343 of 3616 relevant lines covered (92.45%)

3819.38 hits per line