Update to 2026-09-17 pipeline snapshot; add weights, L20 assets and recording via Git LFS

Source: RGB-D -> Dyn-HaMR -> L20 retargeting -> FoundationPose -> reference repair -> SPIDER,
documented in docs/PIPELINE_LATEST.md and docs/SETUP_AND_WEIGHTS.md. Adds FoundationPose and
nvdiffrast upstream snapshots, requirements/pipeline_venv.txt and the FoundationPose weight
manifest/downloader.

Assets (Git LFS): weights/ (WiLoR detector, HandFlow denoiser, UniDepth-L), FoundationPose
checkpoints, HaMeR checkpoint, Dyn-HaMR HMP model and BMC constraints, L20 URDF/meshes, the
20260915_171525 D405 recording and the two box CADs. MANO models are not redistributed
(third_party/hamer/_DATA/data/mano/README.txt). Environments, caches and run outputs excluded.

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

third_party/nvdiffrast/pyproject.toml

@@ -0,0 +1,31 @@
+[build-system]
+requires = [
+  "setuptools>=64",
+  "wheel",
+  "ninja",
+]
+build-backend = "setuptools.build_meta"
+
+[project]
+name = "nvdiffrast"
+version = "0.4.0"
+description = "nvdiffrast - modular primitives for high-performance differentiable rendering"
+readme = "README.md"
+requires-python = ">=3.6"
+#license = "LicenseRef-NSCL"
+#license-files = ["LICENSE.txt"]
+authors = [{name = "Samuli Laine", email = "slaine@nvidia.com"}]
+classifiers = [
+    "Programming Language :: Python :: 3",
+    "Operating System :: OS Independent",
+]
+dependencies = ["numpy"]
+
+[project.urls]
+Homepage = "https://github.com/NVlabs/nvdiffrast"
+Repository = "https://github.com/NVlabs/nvdiffrast"
+Documentation = "https://nvlabs.github.io/nvdiffrast/"
+
+[tool.setuptools.packages.find]
+include = ["nvdiffrast", "nvdiffrast.torch"]
+exclude = ["nvdiffrast.common*"]