Merge the faces stack (#172/#173/#174, integrate-batch-14) into AI RAW denoise (#384)

One config-dir helper (engine::config::config_dir; camera_profiles re-exports it) with both
the face-models and denoise-models defaults; hosts set up both model folders; Settings has
Faces and AI Denoise tabs; both command sets registered; both model dialogs; locale entries
from both; one [features] table per app manifest; Cargo.lock regenerated by cargo; the
DecodedSource cache cost counts both segmentation mattes and the denoised twin.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

crates/gpu/src/render.rs

@@ -717,7 +717,7 @@ pub fn render(
         Err(m) => {
             let img = host.lin.get_or_insert_with(|| Arc::new(cx.read_rgb(&lin, w, h))).clone();
             let l = host.log_l.get_or_insert_with(|| Arc::new(cx.read_plane(&prep.log_l, w, h))).clone();
-            lightcraft_pipeline::masks::evaluate_one(m, &plan.frame, w, h, &img, &l, s.light.exposure as f32)
+            lightcraft_pipeline::masks::evaluate_one(m, &plan.frame, w, h, &img, &l, s.light.exposure as f32, plan.mattes.as_deref())
         }
     });
     lightcraft_pipeline::visualize::apply(&mut image, req.overlay, &plan, overlay_mask.as_ref());
@@ -1018,7 +1018,7 @@ fn masks(cx: &mut Cx<'_>, lin: &Buf, prep: &Prep, plan: &Plan<'_>, host: &mut Ho
                     // no kernel: evaluate on the CPU
                     let img = host.lin.get_or_insert_with(|| Arc::new(cx.read_rgb(lin, w, h))).clone();
                     let l = host.log_l.get_or_insert_with(|| Arc::new(cx.read_plane(&prep.log_l, w, h))).clone();
-                    let mut v = lightcraft_pipeline::masks::shape_alpha(&comp.shape, frame, w, h, &img, &l, ev);
+                    let mut v = lightcraft_pipeline::masks::shape_alpha(&comp.shape, frame, w, h, &img, &l, ev, plan.mattes.as_deref());
                     if comp.invert {
                         v.data.iter_mut().for_each(|x| *x = 1.0 - *x);
                     }