Replace prompt separator from horizontal rule to task markdown heading

- should use # Task instead of ---

└── apps
    └── editor
        └── src
            ├── constants
            │   ├── edit-format-instructions.ts
            │   └── instructions.ts
            └── utils
                └── prompt-builder.ts

Author: robertpiosik

README.md

@@ -140,7 +140,7 @@ Whenever showing a new, updated, renamed, or deleted file, provide a brief expla
 
 [EXAMPLE]
 
----
+# Task
 
 [PROMPT]
 ```
@@ -159,7 +159,7 @@ _Explanations, planning, code reviews, you name it._
 
 [SELECTED FILES]
 
----
+# Task
 
 [PROMPT]
 ```

apps/editor/src/utils/prompt-builder.ts

@@ -109,8 +109,8 @@ export namespace PromptBuilder {
       params.separator &&
       (part1.length > 0 || part2.length > 0 || full_prompt.length > 0)
     ) {
-      part2 = part2.trimEnd() + '\n\n---\n\n'
-      full_prompt = full_prompt.trimEnd() + '\n\n---\n\n'
+      part2 = part2.trimEnd() + '\n\n# Task\n\n'
+      full_prompt = full_prompt.trimEnd() + '\n\n# Task\n\n'
     }
 
     if (params.user_instructions) {