feat: write quarto assignment with encryption

src/model/bank.rs

@@ -352,7 +352,7 @@ fn validate_item(
         issues.push("version must be at least 1".into());
     }
 
-    // --- options ---
+    // --- options ----
     // An open-response item takes no options; its answer lives in `solution`.
     // Every other format needs at least two things to choose between.
     if it.format.has_options() {
@@ -428,7 +428,7 @@ fn validate_item(
         }
     }
 
-    // --- key -----
+    // --- key ---
     let keys = it.key_indices();
     match it.format {
         Format::SingleBestAnswer => {
@@ -465,7 +465,7 @@ fn validate_item(
         }
     }
 
-    // --- level and process must agree --------
+    // --- level and process must agree -------
     if let Some(p) = it.cognitive_process {
         if !it.level.allows(p) {
             issues.push(format!(
@@ -476,7 +476,7 @@ fn validate_item(
         }
     }
 
-    // --- design plausibility -----------
+    // --- design plausibility ------
     if let Some(d) = &it.design {
         if let Some(x) = d.expected_difficulty {
             if !(0.0..=1.0).contains(&x) {
@@ -548,7 +548,7 @@ fn validate_item(
         ));
     }
 
-    // --- retirement ----
+    // --- retirement -----
     if it.retired.is_some() && it.status != Status::Retired {
         issues.push(format!(
             "has a `retired` block but status is `{}`",
@@ -588,7 +588,7 @@ fn validate_item(
         }
     }
 
-    // --- cross-file references ---------
+    // --- cross-file references ----
     if let Some(c) = course {
         for lo in &it.learning_objectives {
             match c.learning_objectives.get(lo) {