fix(build): complete strict lint and test cleanup (replacement for #476)

src/memory/snapshot.rs

@@ -9,6 +9,7 @@
 use anyhow::Result;
 use chrono::Local;
 use rusqlite::{params, Connection};
+use std::fmt::Write;
 use std::fs;
 use std::path::{Path, PathBuf};
 
@@ -63,18 +64,17 @@ pub fn export_snapshot(workspace_dir: &Path) -> Result<usize> {
     output.push_str(SNAPSHOT_HEADER);
 
     let now = Local::now().format("%Y-%m-%d %H:%M:%S").to_string();
-    output.push_str(&format!("**Last exported:** {now}\n\n"));
-    output.push_str(&format!(
-        "**Total core memories:** {}\n\n---\n\n",
-        rows.len()
-    ));
+    write!(output, "**Last exported:** {now}\n\n").unwrap();
+    write!(output, "**Total core memories:** {}\n\n---\n\n", rows.len()).unwrap();
 
     for (key, content, _category, created_at, updated_at) in &rows {
-        output.push_str(&format!("### 🔑 `{key}`\n\n"));
-        output.push_str(&format!("{content}\n\n"));
-        output.push_str(&format!(
+        write!(output, "### 🔑 `{key}`\n\n").unwrap();
+        write!(output, "{content}\n\n").unwrap();
+        write!(
+            output,
             "*Created: {created_at} | Updated: {updated_at}*\n\n---\n\n"
-        ));
+        )
+        .unwrap();
     }
 
     let snapshot_path = snapshot_path(workspace_dir);