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/api_keys.py

@@ -16,12 +16,14 @@ from pathlib import Path
 
 logger = logging.getLogger(__name__)
 
+
 # Valid scope values
 VALID_SCOPES = ["read", "write", "admin"]
 
 # Scope can be single ("read") or multiple space-separated ("read write admin")
 Scope = str
 
+
 def validate_scope(scope: str) -> bool:
     """
     Validate that scope contains only valid scope values.
@@ -38,6 +40,7 @@ def validate_scope(scope: str) -> bool:
     scope_list = scope.split()
     return all(s in VALID_SCOPES for s in scope_list)
 
+
 def normalize_scope(scope: str) -> str:
     """
     Normalize scope string by removing duplicates and sorting.
@@ -56,6 +59,7 @@ def normalize_scope(scope: str) -> str:
             unique_scopes.append(s)
     return " ".join(unique_scopes)
 
+
 @dataclass
 class APIKey:
     """
@@ -105,6 +109,7 @@ class APIKey:
         """Check if key is valid (not revoked, not expired)."""
         return not self.revoked and not self.is_expired()
 
+
 class APIKeyManager:
     """
     Manages per-project API keys with persistence.
@@ -487,9 +492,11 @@ class APIKeyManager:
             "valid": key.is_valid(),
         }
 
+
 # Global instance
 _api_key_manager: APIKeyManager | None = None
 
+
 def get_api_key_manager() -> APIKeyManager:
     """Get the global API Key Manager instance."""
     global _api_key_manager