parseNeedJobNames is replaced by parseNeedEntries which preserves the
optional flag from each needs: entry. When a referenced job does not
exist and optional:true is set, the finding is now WARNING instead of
ERROR, matching GitLab CI runtime behavior (the dependency is silently
skipped when the job is absent from a conditional include).
Optional missing deps are also excluded from the cycle-detection graph
since there is no real dependency edge to trace.
Adds a fixture case in testdata/needs.yml to prevent regression.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
k3nny