1 files changed, 16 insertions, 11 deletions
diff --git a/app/backends/common.py b/app/backends/common.py
index b9448e0..098dfb2 100644
--- a/app/backends/common.py
+++ b/app/backends/common.py
@@ -496,22 +496,27 @@ def git_clone(url: str, target: Path, *, emit=None, cancel=None) -> int:
         emit=emit, cancel=cancel)
 
 
-def pip_install(packages: List[str], *, emit=None, cancel=None) -> int:
-    """pip install PACKAGES into the managed venv (``envs/tts``). Returns exit code.
+def pip_install(packages: List[str], *, emit=None, cancel=None,
+                env_dir: Optional[Path] = None) -> int:
+    """pip install PACKAGES into a managed venv. Returns exit code.
 
     Delegates to ``backends.envs.pip_install`` so backend TTS packages are
-    installed alongside the app requirements in the tool-managed environment
-    rather than into whatever interpreter happens to be running the wizard.
-    With EMIT given (the in-TUI task view) pip runs with its output streamed
-    into EMIT; CANCEL aborts it. The import is local to avoid a circular
-    import (envs imports this module).
+    installed into their dedicated tool-managed environments (``envs/tts``
+    default; ``envs/qwen`` / ``envs/faster`` via ENV_DIR) rather than into
+    whatever interpreter happens to be running the wizard — and never two
+    conflicting stacks into the same env. With EMIT given (the in-TUI task
+    view) pip runs with its output streamed into EMIT; CANCEL aborts it.
+    The import is local to avoid a circular import (envs imports this
+    module).
     """
     from backends import envs
-    return envs.pip_install(packages, emit=emit, cancel=cancel)
+    return envs.pip_install(packages, emit=emit, cancel=cancel,
+                            env_dir=env_dir)
 
 
-def pip_uninstall(packages: List[str], *, emit=None) -> int:
-    """pip uninstall PACKAGES from the managed venv. Returns exit code.
+def pip_uninstall(packages: List[str], *, emit=None,
+                  env_dir: Optional[Path] = None) -> int:
+    """pip uninstall PACKAGES from a managed venv. Returns exit code.
 
     Delegates to ``backends.envs.pip_uninstall`` (local import to avoid a
     circular import). Used by the backends' ``uninstall`` action. With EMIT
@@ -519,4 +524,4 @@ def pip_uninstall(packages: List[str], *, emit=None) -> int:
     its output never touches the terminal behind curses.
     """
     from backends import envs
-    return envs.pip_uninstall(packages, emit=emit)
+    return envs.pip_uninstall(packages, emit=emit, env_dir=env_dir)