Add summary to triage

Author: panstromek

triage/2025-31-03.md

@@ -1,6 +1,6 @@
 # 2025-03-31 Triage Log
 
-TODO: Summary
+Positive week, with a lot of primary improvements and just a few secondary regressions. Single big regression got reverted.
 
 Triage done by **@panstromek**.
 Revision range: [4510e86a..2ea33b59](https://perf.rust-lang.org/?start=4510e86a41388733675465a8647d4235f3bf2023&end=2ea33b591050c4ca1a3752830b29112638faecf6&absolute=false&stat=instructions%3Au)