Adds previews 2, 12, 23, and 14.

previews/002/chamber.mp4

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:7694fb51753e69fbb7c05d140da418b049a32a6996678653f78998bd5dae1910
+size 120751

previews/002/composite.mp4

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:04c19d97550e3432f241b4a3668d0c33a301f607bf5c4104bc54d2fc0bb8617e
+size 681470

previews/002/galvo.mp4

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:aa8b4a2db63dbe06464117c01243a4bcb3b6093940b691602355ed82db31d857
+size 3888

previews/002/thermal.mp4

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:c601193c049bd0ea678ed8685d22ac7a2dd4a7ec17febeb453867cc51c3ab447
+size 557930

previews/012/chamber.mp4

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:45d6ae76c3c60150ebcbfb0cab018103934da5844b1d04c769358737a4ca4ed6
+size 216753075

previews/012/composite.mp4

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:6942006b78dc484d7bd3273c794759d093189a6293dc590d4119cbd4c2197569
+size 1327493343

previews/012/galvo.mp4

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:507b1097682ce8a76fd53ad29b5e07de418e24d0bfd6ffd3a3caa76bf1f6a9be
+size 27436644

previews/012/thermal.mp4

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:700e3bf62daa820c80931a6bff0ed5862ab8eec3698ce5f68641a7343e83db24
+size 1120158907

previews/013/chamber.mp4

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:5d57211cba900d15bdf6cea85fd87c2d80c51f5b344ef9d05b61893d30700076
+size 61040840

previews/013/composite.mp4

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:5b65903255e3db4354cf1f630d0e9961ada6d356698dd1038fe4f2f3d610d742
+size 114041101

previews/013/galvo.mp4

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:7746f553deaacd68ff48b0964b20b56c1fa0f4344f1e9d18569b90eb79921ad3
+size 467969

previews/013/thermal.mp4

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:84fb87117f04f930df5e8e308c56c372a72d45f27f62f3471ab5a90234719436
+size 55420929

previews/014/chamber.mp4

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:2aa840421a84aff2867deaa45ef380fa2c5bda5e0ce1058e75a46a43d23ccf23
+size 7851

scripts/previews/01_render.py

@@ -159,10 +159,14 @@ def process_build(build_id: int) -> None:
     for kind in FRAME_KINDS:
         out = build_dir / f"{kind}.mp4"
         n = render_per_kind(parquet_path, kind, out)
-        print(f"  {kind:8s}: {n:>7,} frames → {out.name} ({out.stat().st_size:,} bytes)")
+        # render_per_kind skips writing entirely when no frames of this kind exist
+        # (and prints its own "skipping" line). Guard stat to avoid FileNotFoundError.
+        if out.exists():
+            print(f"  {kind:8s}: {n:>7,} frames → {out.name} ({out.stat().st_size:,} bytes)")
     out = build_dir / "composite.mp4"
     n = render_composite(parquet_path, out)
-    print(f"  composite: {n:>7,} frames → {out.name} ({out.stat().st_size:,} bytes)")
+    if out.exists():
+        print(f"  composite: {n:>7,} frames → {out.name} ({out.stat().st_size:,} bytes)")
 
 
 def main():