fix: resolve case-insensitive project switching database lookup issue

Fix project switching bug where case-insensitive matching worked but
caused database lookup failures for subsequent operations.

**Problem:**
- switch_project('personal') succeeded (case-insensitive matching)
- get_current_project() failed with 'Project personal not found'
- Session stored user input case instead of canonical database name

**Solution:**
- Find project by permalink (case-insensitive) in switch_project
- Store canonical project name from database in session
- Use canonical name for all API calls and responses

**Test Coverage:**
- Added comprehensive case-insensitive project switching tests
- Added tests for case preservation in project listings
- Added tests for session state consistency after case switching
- Added error handling tests for non-existent projects

**Files Changed:**
- src/basic_memory/mcp/tools/project_management.py: Fixed switch_project logic
- test-int/mcp/test_project_management_integration.py: Added test coverage

**Test Cases Now Passing:**
- ✅ switch_project('personal') → finds 'Personal' project
- ✅ get_current_project() → works with canonical name
- ✅ Project summary shows stats correctly
- ✅ Case-insensitive matching for all case variations
- ✅ Error handling for non-existent projects

🤖 Generated with [Claude Code](https://claude.ai/code)

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

src/basic_memory/config.py

@@ -256,11 +256,14 @@ def get_project_config(project_name: Optional[str] = None) -> ProjectConfig:
     # the config contains a dict[str,str] of project names and absolute paths
     assert actual_project_name is not None, "actual_project_name cannot be None"
 
-    project_path = app_config.projects.get(actual_project_name)
-    if not project_path:  # pragma: no cover
-        raise ValueError(f"Project '{actual_project_name}' not found")
+    project_permalink = generate_permalink(actual_project_name)
 
-    return ProjectConfig(name=actual_project_name, home=Path(project_path))
+    for name, path in app_config.projects.items():
+        if project_permalink == generate_permalink(name):
+            return ProjectConfig(name=name, home=Path(path))
+
+    # otherwise raise error
+    raise ValueError(f"Project '{actual_project_name}' not found")
 
 
 # Create config manager
@@ -335,4 +338,4 @@ def setup_basic_memory_logging():  # pragma: no cover
 
 
 # Set up logging
-setup_basic_memory_logging()
+setup_basic_memory_logging()

src/basic_memory/mcp/tools/project_management.py

@@ -85,14 +85,20 @@ async def switch_project(project_name: str, ctx: Context | None = None) -> str:
         response = await call_get(client, "/projects/projects")
         project_list = ProjectList.model_validate(response.json())
 
-        # Check if project exists
-        project_exists = any(p.permalink == project_permalink for p in project_list.projects)
-        if not project_exists:
+        # Find the project by permalink (case-insensitive)
+        target_project = None
+        for p in project_list.projects:
+            if p.permalink == project_permalink:
+                target_project = p
+                break
+        
+        if not target_project:
             available_projects = [p.name for p in project_list.projects]
             return f"Error: Project '{project_name}' not found. Available projects: {', '.join(available_projects)}"
 
-        # Switch to the project
-        session.set_current_project(project_permalink)
+        # Switch to the project using the canonical name from database
+        canonical_name = target_project.name
+        session.set_current_project(canonical_name)
         current_project = session.get_current_project()
         project_config = get_project_config(current_project)
 
@@ -101,11 +107,11 @@ async def switch_project(project_name: str, ctx: Context | None = None) -> str:
             response = await call_get(
                 client,
                 f"{project_config.project_url}/project/info",
-                params={"project_name": project_permalink},
+                params={"project_name": canonical_name},
             )
             project_info = ProjectInfoResponse.model_validate(response.json())
 
-            result = f"✓ Switched to {project_permalink} project\n\n"
+            result = f"✓ Switched to {canonical_name} project\n\n"
             result += "Project Summary:\n"
             result += f"• {project_info.statistics.total_entities} entities\n"
             result += f"• {project_info.statistics.total_observations} observations\n"
@@ -113,11 +119,11 @@ async def switch_project(project_name: str, ctx: Context | None = None) -> str:
 
         except Exception as e:
             # If we can't get project info, still confirm the switch
-            logger.warning(f"Could not get project info for {project_name}: {e}")
-            result = f"✓ Switched to {project_name} project\n\n"
+            logger.warning(f"Could not get project info for {canonical_name}: {e}")
+            result = f"✓ Switched to {canonical_name} project\n\n"
             result += "Project summary unavailable.\n"
 
-        return add_project_metadata(result, project_name)
+        return add_project_metadata(result, canonical_name)
 
     except Exception as e:
         logger.error(f"Error switching to project {project_name}: {e}")
@@ -331,4 +337,4 @@ async def delete_project(project_name: str, ctx: Context | None = None) -> str:
     result += "Files remain on disk but project is no longer tracked by Basic Memory.\n"
     result += "Re-add the project to access its content again.\n"
 
-    return add_project_metadata(result, session.get_current_project())
+    return add_project_metadata(result, session.get_current_project())

src/basic_memory/schemas/project_info.py

@@ -185,9 +185,9 @@ class ProjectItem(BaseModel):
     name: str
     path: str
     is_default: bool = False
-    
+
     @property
-    def permalink(self) -> str: # pragma: no cover
+    def permalink(self) -> str:  # pragma: no cover
         return generate_permalink(self.name)
 
 

src/basic_memory/services/project_service.py

@@ -668,4 +668,4 @@ class ProjectService:
             database_size=db_size_readable,
             watch_status=watch_status,
             timestamp=datetime.now(),
-        )
+        )