The parallel build skipped a non-map pipeline whose creation raised an
error, so with new_with_format (errors logged, compositor still returned)
its key was missing from kit.pipelines and the first draw panicked on the
`self.kit.pipelines[&(kernel, acc)]` index. As before the PR, a failed
non-map pipeline now keeps its invalid handle (draws report GPU errors);
only a failed effect-map pipeline is skipped (all maps go to the CPU).
Test: a_compositor_with_failed_pipelines_draws_without_panicking builds
new_with_format(Rgb9e5Ufloat) on a device with an uncaptured-error
handler and renders: it panicked at the index without the fix. The PR's
test moves into tests/it (one test binary) and takes GPU_LOCK.
Co-authored-by: 00xJS <56056764+00xJS@users.noreply.github.com>
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
