Clean up unused imports, dead code, and compiler warnings

Remove unused StoreView imports, unused store imports, dead
install_default_file, dead make_report_slug, dead fact-mine/
experience-mine spawning loops in daemon. Fix mut warnings.
Zero compiler warnings now.

poc-memory/src/cli/graph.rs

@@ -6,7 +6,6 @@
 // trace, spectral-*, organize, interference.
 
 use crate::{store, graph, neuro, spectral};
-use crate::store::StoreView;
 
 pub fn cmd_graph() -> Result<(), String> {
     let store = store::Store::load()?;