refactor!: make addrkit a multi-city address normalizer

- remove the events/outages module, ArcGIS adapter, portal config and event statuses
- add a configurable city dictionary/parser and make City part of StreetKey
- seed: read city/city_name, namespace IDs by city, keep structures distinct
- fix reliability: schema v2 with fail-closed load, deterministic ordering,
  input limits, config validation, atomic DB publish, LLM response caps
- add read-only shadow mode comparing the old ES path with addrkit
- breaking: registry.db must be re-seeded; config has no portal section

internal/adapters/llm/rewriter_test.go

@@ -86,3 +86,17 @@ func TestParseVariants(t *testing.T) {
 		})
 	}
 }
+
+func TestParseVariantsCapsCountAndLength(t *testing.T) {
+	long := strings.Repeat("x", 600)
+	content := `{"variants":["` + long + `","a","b","c","d"]}`
+	out := parseVariants(content)
+	if len(out) != 3 {
+		t.Fatalf("variants = %v, want 3", out)
+	}
+	for _, v := range out {
+		if len([]rune(v)) > 512 {
+			t.Fatalf("oversized variant accepted: %d runes", len([]rune(v)))
+		}
+	}
+}