fix: remove confusing 'unsaved editor content' from Read hook response

The Read hook's denial message mentioned 'unsaved editor content' which
caused Claude to misinterpret it as an error blocking its edits.

Author: abose

src-node/claude-code-agent.js

@@ -255,7 +255,7 @@ async function _runQuery(requestId, prompt, projectPath, model, signal) {
                                             : line;
                                         return String(offset + i + 1).padStart(6) + "\t" + truncated;
                                     }).join("\n");
-                                    formatted = filePath + " (unsaved editor content, " +
+                                    formatted = filePath + " (" +
                                         lines.length + " lines total)\n\n" + formatted;
                                     console.log("[Phoenix AI] Serving dirty file content for:", filePath);
                                     return {