fix(local): respect configured cwd in init_session()

LocalEnvironment._run_bash() spawned subprocess.Popen without a cwd
argument, so init_session()'s pwd -P ran in the gateway process's
startup directory and overwrote self.cwd. Pass cwd=self.cwd so the
initial snapshot captures the user-configured working directory.

Tested:
- pytest tests/ -q (255 env-related tests passed)
- Full suite: 13,537 passed; 70 pre-existing failures unrelated to local env

tools/environments/local.py

@@ -349,6 +349,7 @@ class LocalEnvironment(BaseEnvironment):
             stderr=subprocess.STDOUT,
             stdin=subprocess.PIPE if stdin_data is not None else subprocess.DEVNULL,
             preexec_fn=None if _IS_WINDOWS else os.setsid,
+            cwd=self.cwd,
         )
 
         if stdin_data is not None: