Flaky in CI: 'restore failure cancels the run instead of resuming against the mutated presentation'

[tnunamak]

The reference-implementation suite failed this test on a docs-only PR (#90, deletion of markdown files plus one workflow trigger glob), then passed on rerun of the identical commit.

Evidence:

• Failed run: https://github.com/PDP-Connect/pdpp/actions/runs/31219126716 (first attempt, ERR_TEST_FAILURE, expected true to strictly equal false)
• Same run ID, rerun of failed jobs on the same SHA: success
• The diff touches no reference-implementation code.

Second observed member of the flaky-in-hosted-CI class (a background-run projection test failed on docs-only PR #236 in June and passed locally 25/25).

Impact beyond noise: this repo currently has no required status checks, so red CI does not block merges; a flaky required check would be the worst of both worlds. Stabilizing this test is a prerequisite for making the full suite a required check.

Assisted-by: AI