Cleanup ecosystem summary report template (#28891)

.agents/skills/summarise-ecosystem-results/assets/report-template.md

@@ -69,7 +69,7 @@ Do not mention the absence of new panics, overflows, or timeouts. Do not add cha
 **<count> <rule>; <count> <other-rule>**
 
 <details>
-<summary>Report entries (<total> diagnostic hits)</summary>
+<summary>Report entries</summary>
 
 - [<project1 file1.py:line>](<permalink>): <added, removed, or changed> `<rule>`.
 - [<project1 file2.py:line>](<permalink>): <added, removed, or changed> `<other-rule>` (<count> duplicate occurrences).
@@ -104,8 +104,6 @@ if x:
 
 **<Example description>**
 
-*<count> <rule>; <count> <other-rule>*
-
 ```python
 <minimal reproducer>
 ```