Introduced by the commit before this one. Dropping the `WRITES` entry changed
that refusal's wording from `cannot write` to `cannot read`, so the assertion
moved to the part both share — `outside the automation roots` — but
`/elsewhere/proxy.mov` is not absolute on Windows, where it is refused for that
instead and the assertion fails. The gate runs ubuntu only, so it stayed green.
A sibling of the write root under the temp directory is absolute on every
platform, so the refusal is the one the test is about.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>