CedarCopilot/cedar-mail

Branch: staging

fix(jev-gate): never gate a significant event on a participant execution

merged#2916CedarCopilot

CedarCopilot wants to merge 3 commits into staging from fix/jev-gate-skip-participant-significant

What Libra verified

An unresolved primary event does not bypass the participant gate
Libra ran this behavior against the change and confirmed the check detects when it breaks.
Technical evidence
- a participant email with an unresolved significant primary event still lets Jev decide whether the gate skips the run
- a participant email with an unresolved significant primary event continues when Jev says not to skip
Changed code: pre-execution-setup.ts.