Address review on the test framework

- The registry is a Suite, created around the environment factory it runs its
  tests with, so the plugin's env.lua reads as: build environments, hand the
  test files a suite of them. The suite returned there becomes `...` in each
  test file, which is now said where it happens.
- pass and fail are the primitives every other check goes through. eq and
  deep_eq assert rather than compare, failing with both values in the detail.
- Stubs are extended through extend_requires, extend_script, extend_game and
  extend_defines, a recursive merge which raises when a value already exists,
  rather than by mutating the tables. The strict labels carry the factorio
  class names.
- The stubs record registered metatables and can save and load the script
  data the way factorio does: functions are refused and only registered
  metatables survive. env.save_load() uses it, and a new on_load test shows
  role methods and held roles surviving the round trip, which only passes
  because the module registers its metatable.
- The names helper moved out of the shared framework, it is role specific.
- Tests are named after the function or method they cover, on both sides:
  the lua tests read as "role:assign applies locally and is sent", and the
  javascript files wrap their tests in the class they exercise with subtests
  per method. module.test.js is control.test.js, after the file it covers.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

exp_roles/test/messages.test.js

@@ -7,7 +7,7 @@ const fullMeta = new messages.RoleMetaRecord(
 	7, 3, 1, "Mod", "[Mod]", new messages.RoleColor(1, 2, 3), 3600000, true, 12345, false,
 );
 
-t.test("RoleColor", subtest => {
+t.test("class RoleColor", subtest => {
 	testRoundTripJsonSerialisable(messages.RoleColor, testMatrix(
 		[0, 255], // r
 		[0, 128], // g
@@ -17,7 +17,7 @@ t.test("RoleColor", subtest => {
 	subtest.end();
 });
 
-t.test("RoleMetaRecord", subtest => {
+t.test("class RoleMetaRecord", subtest => {
 	testRoundTripJsonSerialisable(messages.RoleMetaRecord, testMatrix(
 		[7], // id
 		[3], // order
@@ -34,7 +34,7 @@ t.test("RoleMetaRecord", subtest => {
 	subtest.end();
 });
 
-t.test("RoleRecord", subtest => {
+t.test("class RoleRecord", subtest => {
 	testRoundTripJsonSerialisable(messages.RoleRecord, testMatrix(
 		[7], // id
 		["Moderator"], // name
@@ -48,7 +48,7 @@ t.test("RoleRecord", subtest => {
 	subtest.end();
 });
 
-t.test("AssignmentRecord", subtest => {
+t.test("class AssignmentRecord", subtest => {
 	testRoundTripJsonSerialisable(messages.AssignmentRecord, testMatrix(
 		["alice"], // name
 		[new Set(), new Set([5, 6])], // roleIds
@@ -59,19 +59,34 @@ t.test("AssignmentRecord", subtest => {
 	subtest.end();
 });
 
-t.test("update events and requests", subtest => {
-	const record = new messages.RoleRecord(7, "Moderator", ["a.b"], fullMeta, true, 12345);
-	const assignment = new messages.AssignmentRecord("alice", new Set([5]), 12345);
+const sampleRecord = new messages.RoleRecord(7, "Moderator", ["a.b"], fullMeta, true, 12345);
+const sampleAssignment = new messages.AssignmentRecord("alice", new Set([5]), 12345);
 
+t.test("class RoleUpdatedEvent", subtest => {
 	testRoundTripJsonSerialisable(messages.RoleUpdatedEvent, testMatrix(
-		[[], [record]], // updates
+		[[], [sampleRecord]], // updates
 	));
+	subtest.pass("round trips");
+	subtest.end();
+});
+
+t.test("class AssignmentUpdatedEvent", subtest => {
 	testRoundTripJsonSerialisable(messages.AssignmentUpdatedEvent, testMatrix(
-		[[], [assignment]], // updates
+		[[], [sampleAssignment]], // updates
 	));
+	subtest.pass("round trips");
+	subtest.end();
+});
+
+t.test("class RoleMetaUpdateRequest", subtest => {
 	testRoundTripJsonSerialisable(messages.RoleMetaUpdateRequest, testMatrix(
 		[new messages.RoleMetaRecord(7, 3), fullMeta], // meta
 	));
+	subtest.pass("round trips");
+	subtest.end();
+});
+
+t.test("class AssignmentUpdateRequest", subtest => {
 	testRoundTripJsonSerialisable(messages.AssignmentUpdateRequest, testMatrix(
 		["alice"], // name
 		[[], [5]], // assign