fix(build): pass PyInstaller hook paths relative so .spec is portable

Absolute paths ended up in the auto-regenerated voicebox-server.spec
because build_binary.py prefixed every --runtime-hook and
--additional-hooks-dir with str(backend_dir / ...). That broke builds
on any machine whose checkout wasn't at /Users/jamie/... and anyone
invoking pyinstaller voicebox-server.spec directly.

os.chdir(backend_dir) already runs before PyInstaller (same reason
server.py works as a bare filename), so the backend_dir prefix is
unnecessary. Drop it so the generated spec references pyi_hooks/,
pyi_rth_numpy_compat.py, pyi_rth_torch_compiler_disable.py as repo-
relative paths.

Co-Authored-By: Claude Opus 4.7 (1M context) <[email protected]>

backend/build_binary.py

@@ -55,20 +55,23 @@ def build_server(cuda=False):
     # numpy 2.x / torch ABI mismatch fix: install memmove fallback for
     # torch.from_numpy() before the app starts. Runtime hooks run after
     # FrozenImporter is registered so frozen torch/numpy are importable.
+    # Paths are passed relative to backend_dir because os.chdir(backend_dir)
+    # runs before PyInstaller. Absolute paths would get baked into the
+    # generated .spec, breaking reproducible builds on other machines / CI.
     args.extend(
         [
             "--runtime-hook",
-            str(backend_dir / "pyi_rth_numpy_compat.py"),
+            "pyi_rth_numpy_compat.py",
             # Stub torch.compiler.disable before transformers imports
             # flex_attention, which otherwise triggers torch._dynamo →
             # torch._numpy._ufuncs and crashes at module load under
             # PyInstaller. See pyi_rth_torch_compiler_disable.py.
             "--runtime-hook",
-            str(backend_dir / "pyi_rth_torch_compiler_disable.py"),
+            "pyi_rth_torch_compiler_disable.py",
             # Per-module collection overrides (e.g. forcing scipy.stats._distn_infrastructure
             # to bundle .py source alongside .pyc so the runtime hook can source-patch it).
             "--additional-hooks-dir",
-            str(backend_dir / "pyi_hooks"),
+            "pyi_hooks",
         ]
     )
 

backend/voicebox-server.spec

@@ -58,9 +58,9 @@ a = Analysis(
     binaries=binaries,
     datas=datas,
     hiddenimports=hiddenimports,
-    hookspath=['/Users/jamie/Projects/spacedriveapp/voicebox/backend/pyi_hooks'],
+    hookspath=['pyi_hooks'],
     hooksconfig={},
-    runtime_hooks=['/Users/jamie/Projects/spacedriveapp/voicebox/backend/pyi_rth_numpy_compat.py', '/Users/jamie/Projects/spacedriveapp/voicebox/backend/pyi_rth_torch_compiler_disable.py'],
+    runtime_hooks=['pyi_rth_numpy_compat.py', 'pyi_rth_torch_compiler_disable.py'],
     excludes=['nvidia', 'nvidia.cublas', 'nvidia.cuda_cupti', 'nvidia.cuda_nvrtc', 'nvidia.cuda_runtime', 'nvidia.cudnn', 'nvidia.cufft', 'nvidia.curand', 'nvidia.cusolver', 'nvidia.cusparse', 'nvidia.nccl', 'nvidia.nvjitlink', 'nvidia.nvtx'],
     noarchive=False,
     optimize=0,