fix(ci): fix black/ruff failures, add CoC and PR template

- Fix Python formatting (sync no longer strips blank lines from .py files)
- Remove test_community_build.py (tests private sync module)
- Fix ruff warnings in test files
- Add CODE_OF_CONDUCT.md
- Add .github/PULL_REQUEST_TEMPLATE.md

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

core/health.py

@@ -27,6 +27,7 @@ from core.project_manager import ProjectManager
 
 logger = logging.getLogger(__name__)
 
+
 @dataclass
 class HealthMetric:
     """Individual health metric data point."""
@@ -47,6 +48,7 @@ class HealthMetric:
             "error_message": self.error_message,
         }
 
+
 @dataclass
 class SystemMetrics:
     """System-wide metrics."""
@@ -63,6 +65,7 @@ class SystemMetrics:
         """Convert to dictionary."""
         return asdict(self)
 
+
 @dataclass
 class ProjectHealthStatus:
     """Comprehensive health status for a project."""
@@ -89,6 +92,7 @@ class ProjectHealthStatus:
             "details": self.details,
         }
 
+
 @dataclass
 class AlertThreshold:
     """Alert threshold configuration."""
@@ -109,6 +113,7 @@ class AlertThreshold:
             return value == self.threshold
         return False
 
+
 class HealthMonitor:
     """
     Enhanced health monitoring system with metrics tracking and alerting.
@@ -657,13 +662,16 @@ class HealthMonitor:
         self.request_timestamps.clear()
         logger.warning("All metrics have been reset")
 
+
 # Singleton instance
 _health_monitor: HealthMonitor | None = None
 
+
 def get_health_monitor() -> HealthMonitor | None:
     """Get the global health monitor instance."""
     return _health_monitor
 
+
 def initialize_health_monitor(
     project_manager: ProjectManager, audit_logger: AuditLogger | None = None, **kwargs
 ) -> HealthMonitor: