test: update pact-task-tracking test for v3 section rename

The v3 rewrite replaced '## On Start' with '## Task Self-Management'
but the test wasn't updated alongside the change, causing a persistent
test failure.

Author: michael-wojcik

pact-plugin/skills/pact-task-tracking/test_skill_loading.py

@@ -70,9 +70,9 @@ def test_name_matches_directory(self, frontmatter):
 class TestKeyContentSections:
     """Test that the skill content includes required sections."""
 
-    def test_has_on_start_section(self, skill_content):
-        """Skill must include 'On Start' section."""
-        assert "## On Start" in skill_content, "SKILL.md must include '## On Start' section"
+    def test_has_task_self_management_section(self, skill_content):
+        """Skill must include 'Task Self-Management' section (v3 replacement for On Start)."""
+        assert "## Task Self-Management" in skill_content, "SKILL.md must include '## Task Self-Management' section"
 
     def test_has_on_blocker_section(self, skill_content):
         """Skill must include 'On Blocker' section."""