Detector::Go::Gf

One JIT-compiled scan per file instead of a Rabin-Karp walk; every .go in the tree reaches this marker check.

The tech name without needing an instance, so the registry can be read off the classes themselves rather than from a parallel list.

Cheap filename-only filter the detector pass uses to skip detect on files the detector cannot possibly match. The default true preserves prior behavior (every detector runs on every file). Override with the same predicate the body of detect starts with — e.g., filename.ends_with?(".py") for a Python framework detector — so the detector loop avoids the detect dispatch on files outside the detector's language.

On large codebases (saleor's 4255 .py files) this lifts ~100 virtual detect calls per file out of the hot loop because most detectors' inner first-line is exactly this kind of cheap filename check.

Detect from go.mod (whole-repo scans) AND any .go file that imports GoFrame, so a sub-directory whose go.mod lives higher up is still recognized when scanned on its own. The analyzer re-gates every file on the same marker, so this can't over-extract.