Pin Bazel 8.5.1 and build the standalone obr module without WORKSPACE

.bazelversion

@@ -1 +1 @@
-7.4.1
+8.5.1

MODULE.bazel

@@ -4,6 +4,7 @@ module(
 )
 
 bazel_dep(name = "bazel_skylib", version = "1.7.1")
+bazel_dep(name = "platforms", version = "1.1.0")
 bazel_dep(name = "rules_cc", version = "0.1.1")
 
 bazel_dep(name = "obr", version = "1.0.0")

src/renderer/obr/obr_capi/obr/.bazelrc

@@ -1,6 +1,2 @@
-# Until we have migrated all deps out of WORKSPACE file, we need to continue to
-# use it. Starting with bazel 8, this flag flips to default false.
-common --enable_workspace
-
 # Toolchain flags shared with the parent oar build live in toolchain.bazelrc.
 import %workspace%/toolchain.bazelrc

src/renderer/obr/obr_capi/obr/.bazelversion

@@ -1 +1 @@
-7.4.1
+8.5.1

src/renderer/obr/obr_capi/obr/docs/building.md

@@ -31,7 +31,7 @@ bazel build -c opt //obr/cli:obr_cli
 
 ### Dependencies
 
-Bazel dependencies are managed through both `MODULE.bazel` (bazelmod) and `WORKSPACE`. The project uses:
+Bazel dependencies are managed through `MODULE.bazel` (Bzlmod). The project uses:
 
 - [Abseil](https://abseil.io/) - C++ common libraries
 - [Eigen](https://eigen.tuxfamily.org/) - Linear algebra

src/renderer/obr/obr_capi/obr/extensions.bzl

@@ -5,11 +5,11 @@ def _pffft_ext_impl(mctx):
         name = "pffft",
         remote = "https://bitbucket.org/jpommier/pffft.git",
         commit = "0aec0327a6912e1a0ec5326eef737c2ce19bc836",
-        # Repository-qualified on purpose: a bare `//external:pffft.BUILD`
+        # Repository-qualified on purpose: a bare `//third_party:pffft.BUILD`
         # resolves against the main repository rather than against the module
         # this file belongs to, so it breaks as soon as obr is consumed as a
         # dependency instead of built on its own.
-        build_file = Label("@obr//external:pffft.BUILD"),
+        build_file = Label("@obr//third_party:pffft.BUILD"),
     )
 
 pffft_ext = module_extension(implementation = _pffft_ext_impl)