fix: remove dead DomainCategory code and fix Codecov config

Remove DomainCategory expansion from _resolve_physics_domain that
referenced a deleted schema file (domains.yaml migrated to
imas-standard-names). Substring matching provides equivalent results.

Fix Codecov action 'file' → 'files' parameter name (v6 API change).

Author: Simon-McIntosh

.github/workflows/test.yml

@@ -85,7 +85,7 @@ jobs:
         uses: codecov/codecov-action@v6
         if: ${{ !cancelled() }}
         with:
-          file: ./coverage.xml
+          files: ./coverage.xml
           flags: unittests
           name: codecov-umbrella
           fail_ci_if_error: false

imas_codex/tools/graph_search.py

@@ -2614,8 +2614,7 @@ def _resolve_physics_domain(
     Resolution order:
     1. Exact match on PhysicsDomain enum value
     2. IDS name → its physics_domain from the graph
-    3. DomainCategory expansion (all domains in that category)
-    4. Substring match on domain names
+    3. Substring match on domain names
 
     Returns:
         (resolved_domains, resolution_method) — list of canonical domain
@@ -2640,31 +2639,7 @@ def _resolve_physics_domain(
         if domains:
             return sorted(set(domains)), f"ids_name:{query}"
 
-    # 3. DomainCategory expansion
-    try:
-        from pathlib import Path
-
-        from linkml_runtime.utils.schemaview import SchemaView
-
-        schema_path = Path(__file__).parent.parent / "definitions/physics/domains.yaml"
-        if schema_path.exists():
-            sv = SchemaView(str(schema_path))
-            cat_enum = sv.get_enum("DomainCategory")
-            if cat_enum and query in cat_enum.permissible_values:
-                pd_enum = sv.get_enum("PhysicsDomain")
-                if pd_enum:
-                    domains = []
-                    for pv_name, pv in pd_enum.permissible_values.items():
-                        ann = pv.annotations.get("category") if pv.annotations else None
-                        cat = ann.value if ann else ""
-                        if cat == query:
-                            domains.append(pv_name)
-                    if domains:
-                        return sorted(domains), f"category:{query}"
-    except Exception:
-        pass
-
-    # 4. Substring match on domain names
+    # 3. Substring match on domain names
     matches = [d for d in sorted(valid_domains) if query in d]
     if matches:
         return matches, f"substring:{query}"

tests/graph_mcp/test_graph_search.py

@@ -677,11 +677,11 @@ def test_no_match(self, graph_client):
         assert domains == []
         assert method == "no_match"
 
-    def test_category_expansion(self, graph_client):
+    def test_substring_expansion(self, graph_client):
         from imas_codex.tools.graph_search import _resolve_physics_domain
 
         domains, method = _resolve_physics_domain(graph_client, "diagnostics")
-        assert method == "category:diagnostics"
+        assert method == "substring:diagnostics"
         assert "magnetic_field_diagnostics" in domains
         assert "radiation_measurement_diagnostics" in domains