Fix setup hooks reading .grove.toml from worktree instead of source repo

The setup config was read from the worktree path, which may not have
.grove.toml if the file isn't committed. Now reads from the source repo
(consistent with how base_branch is read) while still running commands
in the worktree.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: nicksenap

src/grove/workspace.py

@@ -94,7 +94,7 @@ def create_workspace(
 
     # --- Run per-repo setup hooks ---
     for repo_wt in created:
-        _run_setup(repo_wt.repo_name, repo_wt.worktree_path)
+        _run_setup(repo_wt.repo_name, repo_wt.source_repo, repo_wt.worktree_path)
 
     workspace = Workspace(
         name=name,
@@ -106,9 +106,9 @@ def create_workspace(
     return workspace
 
 
-def _run_setup(repo_name: str, worktree_path: Path) -> None:
-    """Run setup commands from ``.grove.toml`` in the worktree."""
-    cfg = git.read_grove_config(worktree_path)
+def _run_setup(repo_name: str, source_repo: Path, worktree_path: Path) -> None:
+    """Run setup commands from ``.grove.toml`` (read from source repo, run in worktree)."""
+    cfg = git.read_grove_config(source_repo)
     setup = cfg.get("setup")
     if not setup:
         return

tests/test_workspace.py

@@ -135,10 +135,12 @@ def test_runs_setup_command(self, tmp_grove):
             patch(
                 "grove.workspace.git.read_grove_config",
                 return_value={"setup": "pnpm install"},
-            ),
+            ) as mock_cfg,
         ):
             ws = workspace.create_workspace("test", {"svc-api": repo_path}, "feat/x", cfg)
             assert ws is not None
+            # Config should be read from the source repo, not the worktree
+            mock_cfg.assert_called_once_with(repo_path)
             mock_sub.assert_called_once_with(
                 "pnpm install",
                 cwd=ws.path / "svc-api",