feat(enhance): discard, tests against a mock ComfyUI, docs (#192)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/enhance/template.rs

@@ -184,9 +184,7 @@ impl Template {
         let user_text = prompt.map(str::trim).filter(|t| !t.is_empty());
         match (&self.prompt, user_text) {
             (None, Some(_)) => {
-                return Err(FillError(
-                    "this template doesn't take a prompt".to_string(),
-                ));
+                return Err(FillError("this template doesn't take a prompt".to_string()));
             }
             (Some(_), None) if self.prompt_required() => {
                 return Err(FillError(
@@ -344,7 +342,9 @@ mod tests {
     #[test]
     fn missing_required_titles_are_rejected_with_a_clear_message() {
         let no_source = RESTORE.replace("imageapi:source", "something else");
-        let err = load(&no_source, PromptMode::Append).unwrap_err().to_string();
+        let err = load(&no_source, PromptMode::Append)
+            .unwrap_err()
+            .to_string();
         assert!(err.contains("imageapi:source"), "{err}");
         let no_save = RESTORE.replace("imageapi:save", "something else");
         let err = load(&no_save, PromptMode::Append).unwrap_err().to_string();
@@ -372,7 +372,9 @@ mod tests {
         let mut v: Value = serde_json::from_str(RESTORE).unwrap();
         v["13"]["inputs"] = json!({"prompt": "base"});
         let t = Template::from_value(cfg("t", PromptMode::Append), v).unwrap();
-        let f = t.fill("Z:\\a.jpg", Some("more"), None, &mut seeds()).unwrap();
+        let f = t
+            .fill("Z:\\a.jpg", Some("more"), None, &mut seeds())
+            .unwrap();
         assert_eq!(input(&f.prompt, "13", "prompt"), "base more");
     }
 
@@ -393,7 +395,9 @@ mod tests {
         assert_eq!(input(&f.prompt, "36", "require_approval"), true);
         // KSampler.seed and TextGenerate's sampling_mode.seed, both fresh.
         let a = input(&f.prompt, "5", "seed").as_u64().unwrap();
-        let b = input(&f.prompt, "14", "sampling_mode.seed").as_u64().unwrap();
+        let b = input(&f.prompt, "14", "sampling_mode.seed")
+            .as_u64()
+            .unwrap();
         assert!(a > 1000 && b > 1000 && a != b);
         assert_ne!(a, 774744764437710);
         // Two fills with a real RNG differ.
@@ -433,7 +437,9 @@ mod tests {
     #[test]
     fn default_join_is_a_single_space_sentence() {
         let t = load(RESTORE, PromptMode::Append).unwrap();
-        let f = t.fill("p", Some("Make it warmer."), None, &mut seeds()).unwrap();
+        let f = t
+            .fill("p", Some("Make it warmer."), None, &mut seeds())
+            .unwrap();
         let text = input(&f.prompt, "13", "value").as_str().unwrap();
         assert!(text.ends_with("Remove any phone interface overlays. Make it warmer."));
     }
@@ -444,7 +450,9 @@ mod tests {
         let err = t.fill("p", None, None, &mut seeds()).unwrap_err();
         assert!(err.0.contains("instruction"));
         assert!(t.fill("p", Some("  "), None, &mut seeds()).is_err());
-        let f = t.fill("p", Some("make it black and white"), None, &mut seeds()).unwrap();
+        let f = t
+            .fill("p", Some("make it black and white"), None, &mut seeds())
+            .unwrap();
         assert_eq!(input(&f.prompt, "13", "value"), "make it black and white");
     }
 
@@ -482,7 +490,11 @@ mod tests {
         assert!(!wf.contains_key("38"));
         // No input anywhere still links to node 38, and the leftover export
         // path can't leak.
-        assert!(!serde_json::to_string(&f.prompt).unwrap().contains("[\"38\""));
+        assert!(
+            !serde_json::to_string(&f.prompt)
+                .unwrap()
+                .contains("[\"38\"")
+        );
         assert!(wf["36"]["inputs"].get("reference_1").is_none());
         // Links to other nodes survive.
         assert_eq!(input(&f.prompt, "36", "source"), &json!(["37", 1]));