feat(client): ContentDB loads canon/ + topics/ built dirs

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01HuHRPE7VfppUJEaoGBEUqZ

client/tests/unit/test_content_db.gd

@@ -50,3 +50,19 @@ func test_null_quest_ref_resolves():
 	var o := _deserter()
 	o["start_quest_id"] = null
 	assert_eq(db.unresolved_refs(o), [])
+
+
+func test_loads_canon_and_topics():
+	assert_true(db.has_canon("town.duncarrow"))
+	assert_true(db.has_canon("place.the-white-antlers"))
+	assert_true(db.has_topic("rumor.travelers-go-missing"))
+
+
+func test_topic_skeleton_has_no_body():
+	var t: Dictionary = db.topic("secret.crell-runs-slave-trade")
+	assert_false(t.has("body"))  # bodies are server-only
+
+
+func test_legacy_npcs_still_load():
+	assert_true(db.has_npc("fenn"))
+	assert_true(db.has_npc("npc.mera-fenn"))