On real PHP source (CPS-IT/mailqueue) a call outside any method has a null
.method; inScope/nestedInLabeled dereferenced it (NullPointerException) and the
script exited 1, losing every taint answer for the repository. 16 sites in
taint/dominance/config/vocabulary.sc now treat a null method as out of scope;
non-null behaviour is unchanged (same outputs on the repro graph for the other
scripts). Static regression test added. Implemented with Codex.
Co-Authored-By: Claude Opus 5.5 <[email protected]>