fix(core): restore LocalProjectIndexRuntimeProvider — it is a real decoupling seam

Commit 9015127 collapsed LocalProjectIndexRuntimeProvider to the concrete
LocalProjectIndexRuntimeFactory on the premise it was the sole impl / pure
indirection. That premise was wrong: services/initialization.py declares its own
matching InitialProjectIndexRuntimeFactory Protocol and passes a value of that
type into run_local_project_index_for_project. The structural Protocol was the
boundary that let the services layer supply a factory without importing the
concrete class from the index layer, so narrowing the parameter to the concrete
broke the assignment (ty: Expected LocalProjectIndexRuntimeFactory, found
InitialProjectIndexRuntimeFactory).

Restore the Protocol and re-type the parameter. Caught by the full-tree ty check
(the collapse's per-chunk typecheck did not cover services/).

Signed-off-by: phernandez <paul@basicmachines.co>

Author: phernandez

src/basic_memory/index/local_project.py

@@ -334,6 +334,18 @@ def total_files(self) -> int:
         return len(self.observed_files)
 
 
+class LocalProjectIndexRuntimeProvider(Protocol):
+    """Minimal factory shape needed to run a local project-index request.
+
+    A structural seam so callers in higher layers (e.g. services/initialization,
+    which declares its own matching InitialProjectIndexRuntimeFactory Protocol)
+    can supply a runtime factory without importing the concrete
+    LocalProjectIndexRuntimeFactory from this module.
+    """
+
+    async def runtime_for_project(self, project: Project) -> LocalProjectIndexRuntime: ...
+
+
 def local_project_embedding_vector_sync(
     dependencies: LocalIndexProjectDependencies,
 ) -> EmbeddingBatchVectorSync | None:
@@ -508,7 +520,7 @@ async def runtime_for_project(self, project: Project) -> LocalProjectIndexRuntim
 async def run_local_project_index_for_project(
     project: Project,
     *,
-    runtime_factory: LocalProjectIndexRuntimeFactory,
+    runtime_factory: LocalProjectIndexRuntimeProvider,
     force_full: bool = False,
     embeddings: bool = True,
 ) -> ProjectIndexCoordinatorResult: