Refactor verdict handling and editor state management

- Removed the Escalate variant from the Verdict enum and associated parsing logic.
- Cleaned up the EditorState struct by removing unused fields and methods.
- Simplified MCP connection functions by removing unnecessary disconnect and handle dismiss functions.
- Added tick count to MiscState for managing UI updates during processing.
- Updated chat and status views to display a spinner during AI processing using the tick count.
- Created a README.md file to document the project, its features, architecture, usage, key bindings, agent modes, security measures, installation instructions, and configuration details.

src/app/harness.rs

@@ -2,7 +2,6 @@
 pub enum Verdict {
     Allow,
     Block(String),
-    Escalate,
 }
 
 pub struct Harness;
@@ -80,7 +79,6 @@ mod tests {
                     "block" => Some(Verdict::Block(
                         v.get("reason").and_then(|r| r.as_str()).unwrap_or("blocked").to_string()
                     )),
-                    "escalate" => Some(Verdict::Escalate),
                     _ => None,
                 };
             }
@@ -153,12 +151,6 @@ mod tests {
         assert_eq!(v, Some(Verdict::Block("dangerous operation".to_string())));
     }
 
-    #[test]
-    fn test_parse_verdict_json_escalate() {
-        let v = parse_verdict(r#"{"verdict": "escalate"}"#);
-        assert_eq!(v, Some(Verdict::Escalate));
-    }
-
     #[test]
     fn test_parse_verdict_text_allow() {
         let v = parse_verdict("Verdict: Allow");