harden network and auth guards, boost themed fill

cruciverb-core/src/puzzle.rs

@@ -241,6 +241,16 @@ pub fn generate_themed_puzzle(
 ) -> Result<Puzzle> {
     let start = Instant::now();
 
+    // Bias the fill toward theme words when a theme is requested.
+    let theme_boost = theme_words
+        .filter(|w| !w.is_empty())
+        .map(|tw| {
+            let mut d = dict.clone();
+            d.boost_theme(tw);
+            d
+        });
+    let solve_dict = theme_boost.as_ref().unwrap_or(dict);
+
     let cores = std::thread::available_parallelism()
         .map(|n| n.get())
         .unwrap_or(1)
@@ -250,7 +260,7 @@ pub fn generate_themed_puzzle(
     if cores > 1 && config.width > 9 {
         return parallel_generate(
             config,
-            dict,
+            solve_dict,
             clue_db,
             difficulty,
             theme,
@@ -260,7 +270,7 @@ pub fn generate_themed_puzzle(
         );
     }
 
-    sequential_generate(config, dict, clue_db, difficulty, theme, theme_words, start)
+    sequential_generate(config, solve_dict, clue_db, difficulty, theme, theme_words, start)
 }
 
 struct SolvedGrid {