feat: settle entries by their system's cores

A system that lists the cores it runs is settled by those cores alone, so an unprofiled core of another system no longer leaves its entries open. Readers whose core runs the entry's system are named first, and cores that only share the file name are listed as such.

tests/test_entry_categories.py

@@ -82,7 +82,7 @@ class Evidence(unittest.TestCase):
         found = self.cats.explain({"name": "diabdat.mpq"}, "ports/diablo/diabdat.mpq", "diablo")
         self.assertEqual(found["category"], GAME_DATA)
         self.assertEqual(found["read_by"], [{
-            "emulator": "devilutionx", "proof": "name",
+            "emulator": "devilutionx", "proof": "name", "runs_system": True,
             "entries": [{"name": "diabdat.mpq", "source_ref": "Source/init.cpp:120"}]}])
         self.assertEqual(verify.category_evidence_text(found),
                          "read by devilutionx (diabdat.mpq at Source/init.cpp:120)")
@@ -91,6 +91,25 @@ class Evidence(unittest.TestCase):
         found = self.cats.explain({"name": "hardwareconfig.xml"},
                                   "bios/Machines/MSX/hardwareconfig.xml", "microsoft-msx")
         self.assertEqual(found, {"category": UNREAD, "cores_examined": ["bluemsx"]})
+
+    def test_the_system_s_own_core_reads_first(self):
+        profiles = {**PROFILES, "other": {
+            "emulator": "Other", "type": "game", "cores": ["other"], "systems": ["elsewhere"],
+            "files": [{"name": "diabdat.mpq", "category": "game_data"}]}}
+        cats = EntryCategories(_config(["bluemsx", "devilutionx", "other"], []), profiles)
+        found = cats.explain({"name": "diabdat.mpq"}, "ports/diablo/diabdat.mpq", "diablo")
+        self.assertEqual([r["emulator"] for r in found["read_by"]], ["devilutionx", "other"])
+        self.assertEqual(verify.category_evidence_text(found),
+                         "read by devilutionx (diabdat.mpq at Source/init.cpp:120), "
+                         "also named by other (diabdat.mpq)")
+
+    def test_a_system_s_own_cores_settle_it(self):
+        config = _config(["bluemsx", "devilutionx", "mystery"], [], system="microsoft-msx")
+        config["systems"]["microsoft-msx"]["cores"] = ["bluemsx"]
+        found = EntryCategories(config, PROFILES).explain(
+            {"name": "hardwareconfig.xml"}, "bios/Machines/MSX/hardwareconfig.xml",
+            "microsoft-msx")
+        self.assertEqual(found, {"category": UNREAD, "cores_examined": ["bluemsx"]})
         self.assertEqual(verify.category_evidence_text(found),
                          "no reader found (cores examined: bluemsx)")