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/audit_log.py

@@ -19,6 +19,7 @@ from enum import Enum
 from pathlib import Path
 from typing import Any
 
+
 class LogLevel(Enum):
     """Log severity levels."""
 
@@ -27,6 +28,7 @@ class LogLevel(Enum):
     ERROR = "ERROR"
     CRITICAL = "CRITICAL"
 
+
 class EventType(Enum):
     """Types of events to log."""
 
@@ -36,6 +38,7 @@ class EventType(Enum):
     ERROR = "error"
     SYSTEM = "system"
 
+
 class AuditLogger:
     """
     Audit logging system for MCP operations.
@@ -554,9 +557,11 @@ class AuditLogger:
             "log_file_size_mb": log_file_size_mb,
         }
 
+
 # Global audit logger instance
 _audit_logger: AuditLogger | None = None
 
+
 def get_audit_logger() -> AuditLogger:
     """Get the global audit logger instance."""
     global _audit_logger