Print total length when truncating long outputs

Provides a little more context for the assistant to work with

Author: endolith

interpreter/core/utils/truncate_output.py

@@ -7,8 +7,8 @@ def truncate_output(data, max_output_chars=2800, add_scrollbars=False):
     # Calculate how much to show from start and end
     chars_per_end = max_output_chars // 2
 
-    message = ("Output truncated. "
-               f"Showing {chars_per_end} characters from start/end. "
+    message = (f"Output truncated ({len(data):,} characters total). "
+               f"Showing {chars_per_end:,} characters from start/end. "
                "To handle large outputs, store result in python var first "
                "`result = command()` then `computer.ai.summarize(result)` for "
                "a summary, search with `result.find('text')`, "