refactor: cap checked values at 60 chars in the details block

Long commit subjects wrapped inside the fenced details block, misaligning
the scope lines. Trimming the value at 60 characters keeps the full line
(prefix + value + parentheses) short enough to stay on one line.

Author: shenxianpeng

main.py

@@ -415,12 +415,14 @@ def _markdown_details(results: list[ScopeResult]) -> str:
     return "\n".join(sections)
 
 
-def _scope_value(scope: ScopeResult, max_len: int = 80) -> str:
+def _scope_value(scope: ScopeResult, max_len: int = 60) -> str:
     """First non-empty check value for a scope, trimmed to a single line.
 
     The value is the concrete thing that was checked (PR title, commit
     subject, branch name, author name/email) and reads naturally next to
-    the scope label in the success details.
+    the scope label in the success details. The 60-character cap keeps the
+    full line (prefix + value + parentheses) short enough to avoid wrapping
+    in the fenced details block.
     """
     for check in scope.checks:
         value = check.get("value", "")

main_test.py

@@ -659,7 +659,7 @@ def test_all_pass_groups_scopes_like_step_log(self):
     def test_all_pass_truncates_long_values(self):
         long_value = "x" * 200
         body = main.render_job_summary([pass_scope("Commit 1/1", value=long_value)])
-        self.assertIn(f"  ✔ Commit 1/1 ({'x' * 77}...)", body)
+        self.assertIn(f"  ✔ Commit 1/1 ({'x' * 57}...)", body)
 
     def test_all_pass_without_value_shows_plain_label(self):
         body = main.render_job_summary([pass_scope("Branch")])