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/agents/llm.rs

@@ -98,7 +98,7 @@ fn call_model_with_tools(agent: &str, model: &str, prompt: &str,
 
     let start = std::time::Instant::now();
 
-    let mut child = unsafe {
+    let child = unsafe {
         cmd.pre_exec(|| {
                 libc::prctl(libc::PR_SET_PDEATHSIG, libc::SIGTERM);
                 Ok(())