fix(shell): preserve login PATH for path append

Made-with: Cursor

nanobot/agent/tools/shell.py

@@ -135,7 +135,11 @@ class ExecTool(Tool):
         env = self._build_env()
 
         if self.path_append:
-            env["PATH"] = env.get("PATH", "") + os.pathsep + self.path_append
+            if _IS_WINDOWS:
+                env["PATH"] = env.get("PATH", "") + os.pathsep + self.path_append
+            else:
+                env["NANOBOT_PATH_APPEND"] = self.path_append
+                command = f'export PATH="$PATH{os.pathsep}$NANOBOT_PATH_APPEND"; {command}'
 
         try:
             process = await self._spawn(command, cwd, env)
@@ -255,7 +259,6 @@ class ExecTool(Tool):
         home = os.environ.get("HOME", "/tmp")
         env = {
             "HOME": home,
-            "PATH": os.environ.get ("PATH", "/usr/bin:/bin"),
             "LANG": os.environ.get("LANG", "C.UTF-8"),
             "TERM": os.environ.get("TERM", "dumb"),
         }
@@ -296,8 +299,8 @@ class ExecTool(Tool):
                     continue
 
                 media_path = get_media_dir().resolve()
-                if (p.is_absolute() 
-                    and cwd_path not in p.parents 
+                if (p.is_absolute()
+                    and cwd_path not in p.parents
                     and p != cwd_path
                     and media_path not in p.parents
                     and p != media_path