python-agent-starter

test: replace LLM-dependent agentic tests with deterministic mocked SSE tests

fix: onFileChanged deletes files from IDB not in snapshot (for delete operations)

fix: save_workspace_files updates request-scoped cache so snapshot_workspace reflects writes and deletes

fix: use snapshot_workspace for file_changed instead of _modified_files, add delete test

fix: set page default timeout 120s for slow agent responses