fix: use platform-native path separators in config.json

Replace .as_posix() with str(path) to preserve platform-native
path separators in config.json. On Windows, paths now correctly
use backslashes (\) instead of forward slashes (/).

Changes:
- src/basic_memory/config.py: Updated 3 locations to use str(path)
  - Line 66: Default project initialization
  - Line 199: model_post_init method
  - Line 364: add_project method
- tests/test_config.py: Updated test assertions to match new behavior

Fixes #428

Co-authored-by: Drew Cain <groksrc@users.noreply.github.com>

src/basic_memory/config.py

@@ -63,7 +63,7 @@ class BasicMemoryConfig(BaseSettings):
 
     projects: Dict[str, str] = Field(
         default_factory=lambda: {
-            "main": Path(os.getenv("BASIC_MEMORY_HOME", Path.home() / "basic-memory")).as_posix()
+            "main": str(Path(os.getenv("BASIC_MEMORY_HOME", Path.home() / "basic-memory")))
         }
         if os.getenv("BASIC_MEMORY_HOME")
         else {},
@@ -196,9 +196,9 @@ class BasicMemoryConfig(BaseSettings):
         """Ensure configuration is valid after initialization."""
         # Ensure at least one project exists; if none exist then create main
         if not self.projects:  # pragma: no cover
-            self.projects["main"] = (
+            self.projects["main"] = str(
                 Path(os.getenv("BASIC_MEMORY_HOME", Path.home() / "basic-memory"))
-            ).as_posix()
+            )
 
         # Ensure default project is valid (i.e. points to an existing project)
         if self.default_project not in self.projects:  # pragma: no cover
@@ -361,7 +361,7 @@ class ConfigManager:
 
         # Load config, modify it, and save it
         config = self.load_config()
-        config.projects[name] = project_path.as_posix()
+        config.projects[name] = str(project_path)
         self.save_config(config)
         return ProjectConfig(name=name, home=project_path)
 

tests/test_config.py

@@ -19,12 +19,12 @@ class TestBasicMemoryConfig:
         config = BasicMemoryConfig()
 
         # Should use the default path (home/basic-memory)
-        expected_path = (config_home / "basic-memory").as_posix()
-        assert config.projects["main"] == Path(expected_path).as_posix()
+        expected_path = str(config_home / "basic-memory")
+        assert config.projects["main"] == expected_path
 
     def test_respects_basic_memory_home_environment_variable(self, config_home, monkeypatch):
         """Test that config respects BASIC_MEMORY_HOME environment variable."""
-        custom_path = (config_home / "app" / "data").as_posix()
+        custom_path = str(config_home / "app" / "data")
         monkeypatch.setenv("BASIC_MEMORY_HOME", custom_path)
 
         config = BasicMemoryConfig()
@@ -44,7 +44,7 @@ class TestBasicMemoryConfig:
 
         # model_post_init should have added main project with BASIC_MEMORY_HOME
         assert "main" in config.projects
-        assert config.projects["main"] == Path(custom_path).as_posix()
+        assert config.projects["main"] == custom_path
 
     def test_model_post_init_respects_basic_memory_home_sets_non_main_default(
         self, config_home, monkeypatch
@@ -55,11 +55,11 @@ class TestBasicMemoryConfig:
 
         # Create config without main project
         other_path = str(config_home / "some" / "path")
-        config = BasicMemoryConfig(projects={"other": Path(other_path).as_posix()})
+        config = BasicMemoryConfig(projects={"other": other_path})
 
         # model_post_init should not add main project with BASIC_MEMORY_HOME
         assert "main" not in config.projects
-        assert config.projects["other"] == Path(other_path).as_posix()
+        assert config.projects["other"] == other_path
 
     def test_model_post_init_fallback_without_basic_memory_home(self, config_home, monkeypatch):
         """Test that model_post_init can set a non-main default when BASIC_MEMORY_HOME is not set."""
@@ -67,12 +67,12 @@ class TestBasicMemoryConfig:
         monkeypatch.delenv("BASIC_MEMORY_HOME", raising=False)
 
         # Create config without main project
-        other_path = (config_home / "some" / "path").as_posix()
+        other_path = str(config_home / "some" / "path")
         config = BasicMemoryConfig(projects={"other": other_path})
 
         # model_post_init should not add main project, but "other" should now be the default
         assert "main" not in config.projects
-        assert config.projects["other"] == Path(other_path).as_posix()
+        assert config.projects["other"] == other_path
 
     def test_basic_memory_home_with_relative_path(self, config_home, monkeypatch):
         """Test that BASIC_MEMORY_HOME works with relative paths."""