phase: 20.49 COMPLETE; 20.50 Flow+String minimal reps; 20.51 selfhost v0/v1 minimal (Option A/B); hv1-inline binop/unop/copy; docs + run_all + CURRENT_TASK -> 21.0

local_tests/mir_try_basic.hako

@@ -0,0 +1,12 @@
+static box Main {
+    main() {
+        try {
+            print("in try")
+            throw "oops"
+        } catch (Exception e) {
+            print("caught")
+        }
+        print("after")
+    }
+}
+