fix: Eliminate all 111 test warnings by fixing root causes

- Replace deprecated datetime.utcnow() with datetime.now(timezone.utc)
  across all domain models, services, infrastructure, and test files
- Add missing timezone imports to all affected files
- Fix pytest.ini configuration format from [tool:pytest] to [pytest]
- Remove warning suppressions to expose actual issues
- Ensure proper pytest marker registration for smoke tests

Results:
- 305 passed, 2 skipped, 0 warnings (down from 111 warnings)
- All functionality preserved with modern datetime API usage
- Improved code quality by addressing root causes vs suppression

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

tests/unit/domain/issues/test_issue_services.py

@@ -5,7 +5,7 @@ Tests business logic in issue services with no external dependencies.
 """
 
 import pytest
-from datetime import datetime, timedelta
+from datetime import datetime, timedelta, timezone
 
 from domain.issues.models import Issue, Label, IssueState
 from domain.issues.services import IssueStatusService, IssueValidationService
@@ -26,8 +26,8 @@ class TestIssueStatusService:
             title="Closed Issue",
             state=IssueState.CLOSED,
             labels=[],
-            created_at=datetime.utcnow(),
-            updated_at=datetime.utcnow()
+            created_at=datetime.now(timezone.utc),
+            updated_at=datetime.now(timezone.utc)
         )
         project_info = {"kanban_columns": ["Todo", "In Progress", "Review", "Done"]}
 
@@ -50,8 +50,8 @@ class TestIssueStatusService:
             title="Test Issue",
             state=IssueState.OPEN,
             labels=[Label(status_label)],
-            created_at=datetime.utcnow(),
-            updated_at=datetime.utcnow()
+            created_at=datetime.now(timezone.utc),
+            updated_at=datetime.now(timezone.utc)
         )
         project_info = {"kanban_columns": ["Todo", "In Progress", "Review", "Blocked", "Ready", "Done"]}
 
@@ -68,8 +68,8 @@ class TestIssueStatusService:
             title="New Issue",
             state=IssueState.OPEN,
             labels=[Label("bug")],  # No status label
-            created_at=datetime.utcnow(),
-            updated_at=datetime.utcnow()
+            created_at=datetime.now(timezone.utc),
+            updated_at=datetime.now(timezone.utc)
         )
         project_info = {"kanban_columns": ["Todo", "In Progress", "Done"]}
 
@@ -92,8 +92,8 @@ class TestIssueStatusService:
             title="Test",
             state=IssueState.OPEN,
             labels=[Label(priority_label)],
-            created_at=datetime.utcnow(),
-            updated_at=datetime.utcnow()
+            created_at=datetime.now(timezone.utc),
+            updated_at=datetime.now(timezone.utc)
         )
 
         # Act
@@ -110,8 +110,8 @@ class TestIssueStatusService:
             title="Test",
             state=IssueState.OPEN,
             labels=[Label("bug")],  # No priority label
-            created_at=datetime.utcnow(),
-            updated_at=datetime.utcnow()
+            created_at=datetime.now(timezone.utc),
+            updated_at=datetime.now(timezone.utc)
         )
 
         # Act
@@ -128,8 +128,8 @@ class TestIssueStatusService:
             title="Test",
             state=IssueState.OPEN,
             labels=[Label("status:in-progress")],
-            created_at=datetime.utcnow(),
-            updated_at=datetime.utcnow()
+            created_at=datetime.now(timezone.utc),
+            updated_at=datetime.now(timezone.utc)
         )
 
         # Act
@@ -143,14 +143,14 @@ class TestIssueStatusService:
 
     def test_extract_state_info_for_closed_issue(self, service):
         # Arrange
-        closed_at = datetime.utcnow()
+        closed_at = datetime.now(timezone.utc)
         issue = Issue(
             number=1,
             title="Test",
             state=IssueState.CLOSED,
             labels=[],
-            created_at=datetime.utcnow(),
-            updated_at=datetime.utcnow(),
+            created_at=datetime.now(timezone.utc),
+            updated_at=datetime.now(timezone.utc),
             closed_at=closed_at
         )
 
@@ -164,14 +164,14 @@ class TestIssueStatusService:
 
     def test_calculate_issue_age_days(self, service):
         # Arrange
-        created_at = datetime.utcnow() - timedelta(days=5)
+        created_at = datetime.now(timezone.utc) - timedelta(days=5)
         issue = Issue(
             number=1,
             title="Test",
             state=IssueState.OPEN,
             labels=[],
             created_at=created_at,
-            updated_at=datetime.utcnow()
+            updated_at=datetime.now(timezone.utc)
         )
 
         # Act
@@ -182,14 +182,14 @@ class TestIssueStatusService:
 
     def test_is_stale_issue_with_old_open_issue(self, service):
         # Arrange
-        created_at = datetime.utcnow() - timedelta(days=45)
+        created_at = datetime.now(timezone.utc) - timedelta(days=45)
         issue = Issue(
             number=1,
             title="Test",
             state=IssueState.OPEN,
             labels=[],
             created_at=created_at,
-            updated_at=datetime.utcnow()
+            updated_at=datetime.now(timezone.utc)
         )
 
         # Act
@@ -200,14 +200,14 @@ class TestIssueStatusService:
 
     def test_is_stale_issue_with_recent_open_issue(self, service):
         # Arrange
-        created_at = datetime.utcnow() - timedelta(days=15)
+        created_at = datetime.now(timezone.utc) - timedelta(days=15)
         issue = Issue(
             number=1,
             title="Test",
             state=IssueState.OPEN,
             labels=[],
             created_at=created_at,
-            updated_at=datetime.utcnow()
+            updated_at=datetime.now(timezone.utc)
         )
 
         # Act
@@ -218,15 +218,15 @@ class TestIssueStatusService:
 
     def test_is_stale_issue_with_closed_issue_never_stale(self, service):
         # Arrange
-        created_at = datetime.utcnow() - timedelta(days=100)
+        created_at = datetime.now(timezone.utc) - timedelta(days=100)
         issue = Issue(
             number=1,
             title="Test",
             state=IssueState.CLOSED,
             labels=[],
             created_at=created_at,
-            updated_at=datetime.utcnow(),
-            closed_at=datetime.utcnow()
+            updated_at=datetime.now(timezone.utc),
+            closed_at=datetime.now(timezone.utc)
         )
 
         # Act
@@ -322,8 +322,8 @@ class TestIssueValidationService:
             title="Test",
             state=IssueState.OPEN,
             labels=[Label("bug")],
-            created_at=datetime.utcnow(),
-            updated_at=datetime.utcnow()
+            created_at=datetime.now(timezone.utc),
+            updated_at=datetime.now(timezone.utc)
         )
         new_label = "enhancement"
 
@@ -337,8 +337,8 @@ class TestIssueValidationService:
             title="Test",
             state=IssueState.OPEN,
             labels=[Label("bug")],
-            created_at=datetime.utcnow(),
-            updated_at=datetime.utcnow()
+            created_at=datetime.now(timezone.utc),
+            updated_at=datetime.now(timezone.utc)
         )
         new_label = "bug"
 
@@ -355,8 +355,8 @@ class TestIssueValidationService:
             title="Test",
             state=IssueState.OPEN,
             labels=[Label("priority:high")],
-            created_at=datetime.utcnow(),
-            updated_at=datetime.utcnow()
+            created_at=datetime.now(timezone.utc),
+            updated_at=datetime.now(timezone.utc)
         )
         new_label = "priority:low"