test(ci): event policy probe (do not merge)

[chhoumann]

Summary

Temporary draft PR that checks this repository's Actions event policy admits its reviewed pull_request_target workflows. Its only change is a temporary Markdown file under .github. Never merge this PR. It is closed unmerged after the checks.

Verification

The coordinator records the local check log, the policy ID and read-back, the head SHA, the title check run, the negative-control outcome and the closed-event run IDs in the CI2 ledger. No Obsidian runtime verification applies.

Release impact

None. The branch is outside release/, and no release job or manual trigger runs.

Note

Add CI2 event-policy probe test file

Adds a temporary one-line file ci2-event-policy-probe.md with a probe identifier. Marked as a CI test — the PR title says do not merge.

^{Macroscope summarized 5e8487b.}