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/admin.rs

@@ -11,7 +11,6 @@ fn install_default_file(data_dir: &std::path::Path, name: &str, content: &str) -
     Ok(())
 }
 
-use crate::store::StoreView;
 
 pub fn cmd_init() -> Result<(), String> {
     let cfg = crate::config::get();