M15.2: merge main (disk cache, 3D Camera Tracker); camera analysis in workers; no disk cache on wasm32

The 3D Camera Tracker analysis joins the offloaded jobs. The disk cache stays off in the
browser (std::env::temp_dir panics on wasm32 once a config store exists).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

xtask/src/main.rs

@@ -23,14 +23,18 @@ const LAYERS: &[(&str, u8)] = &[
     ("time", 0),
     ("geom", 0),
     ("color", 0),
+    ("vp9enc", 0),
     ("testkit", 0),
+    ("opusenc", 0),
     ("raster", 1),
     ("keyframe", 1),
     ("path", 1),
+    ("psd", 1),
     ("project", 2),
     ("text", 2),
     ("effects", 2),
     ("track", 2),
+    ("svg", 2),
     ("model", 2),
     ("render", 3),
     ("media", 3),