Answer M1: tract loads both face graphs once their dims are pinned

Neither InsightFace export parses as shipped -- SCRFD fails at its input
node, ArcFace at the first Conv -- which is the same wall dr-segment hit
on YOLO's dynamic export. Both load cleanly with the input dims frozen,
so the pure-Rust runtime holds for the face pipeline too.

tools/fix-face-model-shapes.sh does the freezing, and exists so the
artefact is reproducible rather than a binary someone once produced. It
takes two forms because the two graphs need different ones: ArcFace's
batch is a named dim_param, SCRFD's H and W are dynamic but unnamed.

Also notes YuNet loading with no intervention, which matters for the
licence question in faces.md 2.3.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

Cargo.toml

@@ -6,6 +6,7 @@ members = [
     "core/dr-thumbs",
     "core/dr-decode",
     "core/dr-export",
+    "core/dr-face",
     "core/dr-film",
     "core/dr-ingest",
     "core/dr-gpu",
@@ -35,6 +36,10 @@ dr-catalog = { path = "core/dr-catalog" }
 dr-thumbs = { path = "core/dr-thumbs" }
 dr-decode = { path = "core/dr-decode" }
 dr-export = { path = "core/dr-export" }
+# Stated explicitly for the same reason as `dr-segment` below: no dependant
+# should drag in an ONNX runtime by accident. Members opt in with
+# `features = ["inference"]`.
+dr-face = { path = "core/dr-face", default-features = false }
 dr-film = { path = "core/dr-film" }
 dr-ingest = { path = "core/dr-ingest" }
 dr-gpu = { path = "core/dr-gpu" }