MemoryStorage, DebugSummaryCommand tests

New test files: LlmControllerTest, FileLlmHistoryStorageTest,
FileLlmSettingsTest, McpSettingsControllerTest.
Expand FileController, ServerSentEventsStream, DebugSummaryCommand,
GarbageCollector, MemoryStorage tests.

https://claude.ai/code/session_01DG4gh3vpSttWzWioV8aiGW