feat: instruct Claude Code to review optimizations in subagent mode

The subagent action instructions now tell Claude Code to read the
original source, compare it against the optimized code, and check for
correctness and quality issues before presenting the result to the user.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: aseembits93

codeflash/cli_cmds/console.py

@@ -469,12 +469,22 @@ def subagent_log_optimization_result(
             xml.append(f'  <optimized-code file="{escape(str(path))}">{escape(new_code[path])}</optimized-code>')
     xml.append("  <action>")
     xml.append("    First, present a short summary: function name, performance improvement, and explanation.")
+    xml.append("    Then, review the proposed optimization yourself before presenting it to the user:")
+    xml.append("      - Read the original source file to understand the full context around the function.")
+    xml.append("      - Compare the original code with the optimized code in the diff above.")
+    xml.append("      - Check for correctness issues: changed semantics, dropped edge cases, altered error handling,")
+    xml.append("        missing side effects, or differences in return values/types.")
+    xml.append("      - Check for code quality issues: readability regressions, removed comments or docstrings")
+    xml.append("        that were valuable, unnecessary complexity, or non-idiomatic patterns.")
+    xml.append("      - State your assessment: whether the optimization looks correct and safe to apply,")
+    xml.append("        or flag specific concerns the user should be aware of.")
+    xml.append("    After your review:")
     xml.append("    If you are running inside an IDE (VS Code, Cursor, Windsurf, etc.):")
     xml.append("      For each optimized-code element, use the Write tool to write the optimized code to the file.")
     xml.append("      This will surface the diff in the IDE's native diff view for the user to accept or reject.")
     xml.append("    If you are running in a terminal without an IDE connection:")
     xml.append("      Present this optimization to the user using AskUserQuestion.")
-    xml.append("      Show the function name, performance improvement, and explanation as the question text.")
+    xml.append("      Show the function name, performance improvement, explanation, and your review as the question.")
     xml.append("      Provide two options: 'Apply' (write the optimized code to the file) and 'Reject' (do nothing).")
     xml.append(
         "      Put the full diff in the 'Apply' option's markdown preview so the user can review the exact changes."