refactor: rename CloudEvents extension attributes hub* → central*

Rename extension attributes for consistency with project naming:
- hubschemaversion → centralschemaversion
- hubcategory → centralcategory
- hubseverity → centralseverity

Non-breaking change - no consumers depend on these names yet.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/central/cloudevents_wire.py

@@ -11,27 +11,27 @@ from central.models import Event
 def wrap_event(event: Event, config: Config) -> tuple[dict[str, Any], str]:
     """
     Wrap an Event into a CNCF CloudEvents v1.0 JSON envelope.
-    
+
     Returns:
         A tuple of (envelope_dict, msg_id) where msg_id is the
         CloudEvent id for use as Nats-Msg-Id header.
     """
     # Build CE type: {prefix}.{category}.v1
     ce_type = f"{config.cloudevents.type_prefix}.{event.category}.v1"
-    
+
     # Serialize event data
     event_data = event.model_dump(mode="json")
-    
+
     # Build extension attributes - lowercase, no underscores per CE spec
     extensions: dict[str, Any] = {
-        "hubschemaversion": config.cloudevents.schema_version,
+        "centralschemaversion": config.cloudevents.schema_version,
-        "hubcategory": event.category,
+        "centralcategory": event.category,
     }
-    
+
-    # Only include hubseverity if severity is present
+    # Only include centralseverity if severity is present
     if event.severity is not None:
-        extensions["hubseverity"] = event.severity
+        extensions["centralseverity"] = event.severity
-    
+
     # Create CloudEvent
     ce = CloudEvent(
         attributes={
@@ -44,9 +44,9 @@ def wrap_event(event: Event, config: Config) -> tuple[dict[str, Any], str]:
         },
         data=event_data,
     )
-    
+
     # Build envelope dict from CloudEvent
     envelope: dict[str, Any] = dict(ce.get_attributes())
     envelope["data"] = ce.data
-    
+
     return envelope, event.id

tests/test_models.py

@@ -59,12 +59,12 @@ def sample_config() -> Config:
 
 class TestSubjectForEvent:
     """Tests for subject_for_event helper."""
-    
+
     def test_county_subject(self, sample_event: Event) -> None:
         """County codes produce county subject."""
         subject = subject_for_event(sample_event)
         assert subject == "central.wx.alert.us.id.county.ada"
-    
+
     def test_zone_subject(self, sample_geo: Geo) -> None:
         """Zone codes produce zone subject."""
         geo = Geo(
@@ -83,7 +83,7 @@ class TestSubjectForEvent:
         )
         subject = subject_for_event(event)
         assert subject == "central.wx.alert.us.id.zone.z033"
-    
+
     def test_unknown_subject(self, sample_event: Event) -> None:
         """Missing primary_region produces unknown subject."""
         geo = Geo(regions=[], primary_region=None)
@@ -97,7 +97,7 @@ class TestSubjectForEvent:
         )
         subject = subject_for_event(event)
         assert subject == "central.wx.alert.us.unknown"
-    
+
     def test_custom_prefix(self, sample_event: Event) -> None:
         """Custom prefix is used in subject."""
         subject = subject_for_event(sample_event, prefix="myapp.events")
@@ -106,13 +106,13 @@ class TestSubjectForEvent:
 
 class TestCloudEventsWire:
     """Tests for CloudEvents wire format."""
-    
+
     def test_required_fields_present(
         self, sample_event: Event, sample_config: Config
     ) -> None:
         """Required CloudEvents fields are present."""
         envelope, msg_id = wrap_event(sample_event, sample_config)
-        
+
         assert msg_id == sample_event.id
         assert envelope["id"] == sample_event.id
         assert envelope["source"] == sample_config.cloudevents.source
@@ -121,27 +121,27 @@ class TestCloudEventsWire:
         assert "time" in envelope
         assert envelope["datacontenttype"] == "application/json"
         assert "data" in envelope
-    
+
     def test_extension_attributes_lowercase(
         self, sample_event: Event, sample_config: Config
     ) -> None:
         """Extension attributes are lowercase with no underscores."""
         envelope, _ = wrap_event(sample_event, sample_config)
-        
+
         # Check that extension attributes exist and are lowercase
-        assert envelope["hubschemaversion"] == "1.0"
+        assert envelope["centralschemaversion"] == "1.0"
-        assert envelope["hubcategory"] == "wx.alert.severe_thunderstorm_warning"
+        assert envelope["centralcategory"] == "wx.alert.severe_thunderstorm_warning"
-        assert envelope["hubseverity"] == 3
+        assert envelope["centralseverity"] == 3
-        
+
         # Verify no uppercase or underscores in extension names
-        for key in ["hubschemaversion", "hubcategory", "hubseverity"]:
+        for key in ["centralschemaversion", "centralcategory", "centralseverity"]:
             assert key.islower()
             assert "_" not in key
-    
+
-    def test_severity_none_omits_hubseverity(
+    def test_severity_none_omits_centralseverity(
         self, sample_geo: Geo, sample_config: Config
     ) -> None:
-        """When severity is None, hubseverity is omitted entirely."""
+        """When severity is None, centralseverity is omitted entirely."""
         event = Event(
             id="test-no-severity",
             source="test",
@@ -151,11 +151,11 @@ class TestCloudEventsWire:
             geo=sample_geo,
             data={},
         )
-        
+
         envelope, _ = wrap_event(event, sample_config)
-        
+
-        # hubseverity should not be present at all
+        # centralseverity should not be present at all
-        assert "hubseverity" not in envelope
+        assert "centralseverity" not in envelope
         # Other extensions should still be present
-        assert "hubschemaversion" in envelope
+        assert "centralschemaversion" in envelope
-        assert "hubcategory" in envelope
+        assert "centralcategory" in envelope