fix: eliminate all test suite warnings - Issue #129

Comprehensive fix for test suite warnings across multiple issue test files:

### SQLite3 Date Adapter Warnings (Python 3.12)
- Fixed 101 warnings in Issue 113 (activity_tracker.py)
- Fixed 55 warnings in Issue 114 (allocation_engine.py)
- Fixed 148 warnings in Issue 122 (worktime_tracker.py + test file)
- Fixed 18 warnings in Issue 124 (day_wrapup_commands.py + worktime_tracker.py)

### Pytest-asyncio Configuration
- Added asyncio_default_fixture_loop_scope = function to pytest.ini
- Eliminates pytest-asyncio deprecation warning

### Runtime Warnings for Unawaited Coroutines
- Fixed 2 warnings in Issue 59 (gitea plugin async mocking)
- Enhanced AsyncTestCase with better coroutine cleanup
- Improved async mock management in test utilities

### Technical Changes
- Convert Python date/datetime objects to ISO strings before SQLite queries
- Use .isoformat() with defensive hasattr() checks for backward compatibility
- Simplified async test mocking to avoid coroutine creation
- Enhanced cleanup_async_mocks() function for comprehensive cleanup

### Results
- Before: ~324 warnings across test suite
- After: 0 warnings - completely clean test suite
- All 216+ tests pass with zero warning noise

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

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

markitect/finance/worktime_tracker.py

@@ -167,7 +167,7 @@ class WorktimeTracker:
                 INSERT INTO worktime_entries
                 (issue_id, work_date, start_time, end_time, duration_minutes, description, entry_type)
                 VALUES (?, ?, ?, ?, ?, ?, ?)
-            ''', (issue_id, work_date, start_time, end_time, duration_minutes, description, entry_type))
+            ''', (issue_id, work_date.isoformat() if hasattr(work_date, 'isoformat') else work_date, start_time.isoformat() if hasattr(start_time, 'isoformat') else start_time, end_time.isoformat() if hasattr(end_time, 'isoformat') else end_time, duration_minutes, description, entry_type))
 
             entry_id = cursor.lastrowid
 
@@ -187,7 +187,7 @@ class WorktimeTracker:
                 SUM(duration_minutes) as total_minutes
             FROM worktime_entries
             WHERE work_date = ?
-        ''', (work_date,))
+        ''', (work_date.isoformat() if hasattr(work_date, 'isoformat') else work_date,))
 
         result = cursor.fetchone()
         issue_count = result[0] or 0
@@ -198,7 +198,7 @@ class WorktimeTracker:
             INSERT OR REPLACE INTO daily_worktime_summaries
             (work_date, total_minutes, issue_count)
             VALUES (?, ?, ?)
-        ''', (work_date, total_minutes, issue_count))
+        ''', (work_date.isoformat() if hasattr(work_date, 'isoformat') else work_date, total_minutes, issue_count))
 
     def get_worktime_entries(self,
                            issue_id: Optional[int] = None,
@@ -236,16 +236,16 @@ class WorktimeTracker:
 
             if work_date:
                 query += ' AND work_date = ?'
-                params.append(work_date)
+                params.append(work_date.isoformat() if hasattr(work_date, 'isoformat') else work_date)
             elif start_date and end_date:
                 query += ' AND work_date BETWEEN ? AND ?'
-                params.extend([start_date, end_date])
+                params.extend([start_date.isoformat() if hasattr(start_date, 'isoformat') else start_date, end_date.isoformat() if hasattr(end_date, 'isoformat') else end_date])
             elif start_date:
                 query += ' AND work_date >= ?'
-                params.append(start_date)
+                params.append(start_date.isoformat() if hasattr(start_date, 'isoformat') else start_date)
             elif end_date:
                 query += ' AND work_date <= ?'
-                params.append(end_date)
+                params.append(end_date.isoformat() if hasattr(end_date, 'isoformat') else end_date)
 
             query += ' ORDER BY work_date DESC, start_time DESC'
 
@@ -298,7 +298,7 @@ class WorktimeTracker:
                 SELECT cost_per_minute, total_cost_allocated
                 FROM daily_worktime_summaries
                 WHERE work_date = ?
-            ''', (work_date,))
+            ''', (work_date.isoformat() if hasattr(work_date, 'isoformat') else work_date,))
             result = cursor.fetchone()
 
             cost_per_minute = Decimal(str(result[0])) if result and result[0] else None
@@ -406,7 +406,7 @@ class WorktimeTracker:
                 FROM issue_activity_log
                 WHERE activity_date = ? AND issue_id IN ({placeholders})
                 GROUP BY issue_id
-            ''', [work_date] + issues)
+            ''', [work_date.isoformat() if hasattr(work_date, 'isoformat') else work_date] + issues)
             return dict(cursor.fetchall())
 
     def distribute_daily_costs(self,
@@ -469,14 +469,14 @@ class WorktimeTracker:
                     INSERT OR REPLACE INTO worktime_cost_distributions
                     (work_date, issue_id, time_minutes, cost_allocated, cost_per_minute, period_id)
                     VALUES (?, ?, ?, ?, ?, ?)
-                ''', (work_date, issue_id, minutes, float(cost_allocated), float(cost_per_minute), period_id))
+                ''', (work_date.isoformat() if hasattr(work_date, 'isoformat') else work_date, issue_id, minutes, float(cost_allocated), float(cost_per_minute), period_id))
 
             # Update daily summary with cost information
             cursor.execute('''
                 UPDATE daily_worktime_summaries
                 SET cost_per_minute = ?, total_cost_allocated = ?, updated_at = CURRENT_TIMESTAMP
                 WHERE work_date = ?
-            ''', (float(cost_per_minute), float(total_daily_cost), work_date))
+            ''', (float(cost_per_minute), float(total_daily_cost), work_date.isoformat() if hasattr(work_date, 'isoformat') else work_date))
 
         return {
             "work_date": work_date,