refactored: to utilise the google adk and production grade agent

tests/test_skill_loader.py

@@ -7,12 +7,13 @@ from app.config import get_settings
 
 
 def test_skill_loader_discovery():
-    """Verify SkillLoader discovers all 4 phase skills under app/skills/."""
+    """Verify SkillLoader discovers all phase skills under app/skills/."""
     settings = get_settings()
     loader = SkillLoader(settings.SKILLS_DIR)
     skills = loader.load_skills()
 
-    assert len(skills) >= 4
+    assert len(skills) >= 5
+    assert "source_discovery" in skills
     assert "requirements_discovery" in skills
     assert "architecture_design" in skills
     assert "validation_rules" in skills
@@ -25,6 +26,10 @@ def test_skill_loader_by_phase():
     loader = SkillLoader(settings.SKILLS_DIR)
     loader.load_skills()
 
+    src_discover_skills = loader.get_skills_by_phase("source_discover")
+    assert len(src_discover_skills) == 1
+    assert src_discover_skills[0].name == "source_discovery"
+
     discover_skills = loader.get_skills_by_phase("discover")
     assert len(discover_skills) == 1
     assert discover_skills[0].name == "requirements_discovery"