Resolve fish-speech root via __path__ (namespace package)

fish_speech is a PEP 420 namespace package on the Space, so __file__ is
None and the previous fallback raised TypeError. Locate the package dir
via __path__[0] (or by walking up setup_root's caller path) and use its
parent as the project root.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

tts/engine.py

@@ -88,11 +88,36 @@ def _patch_pyrootutils() -> None:
         try:
             return _orig_setup_root(*args, **kwargs)
         except FileNotFoundError:
-            import fish_speech
             import sys
             from pathlib import Path
 
-            root = Path(fish_speech.__file__).resolve().parent.parent
+            # fish_speech is a PEP 420 namespace package here, so __file__ is None;
+            # locate its directory via __path__, falling back to the calling module's
+            # path (setup_root's first arg). The project root is the dir *containing*
+            # the fish_speech package, mirroring the repo's .project-root location.
+            pkg_dir = None
+            try:
+                import fish_speech
+
+                paths = list(getattr(fish_speech, "__path__", []) or [])
+                if paths:
+                    pkg_dir = Path(paths[0]).resolve()
+                elif getattr(fish_speech, "__file__", None):
+                    pkg_dir = Path(fish_speech.__file__).resolve().parent
+            except Exception:
+                pkg_dir = None
+
+            if pkg_dir is None and args:
+                sf = Path(str(args[0])).resolve()
+                for p in [sf, *sf.parents]:
+                    if p.name == "fish_speech":
+                        pkg_dir = p
+                        break
+
+            if pkg_dir is None:
+                raise  # nothing to fall back to — re-raise the original error
+
+            root = pkg_dir.parent
             if kwargs.get("pythonpath", False) and str(root) not in sys.path:
                 sys.path.insert(0, str(root))
             if kwargs.get("project_root_env_var", True):