feat(web): add incremental modifier reader batch

tools/web/bind-wbv2-module-coverage.mjs

@@ -32,12 +32,25 @@ if (!coverageBindings.length) throw new Error(`task ${task} has no coverageBindi
 const production = json(productionPath);
 assert.equal(production.browser, "chromium");
 assert.equal(production.queueMutation, false);
-assert.equal(production.error, undefined);
-assert.equal(production.saveReopenExact, true);
-assert.equal(production.deterministicExact, true);
 const inventoryPath = "tests/golden/WBV2/dynamic-inventory.json";
 const inventory = json(inventoryPath);
-assert.equal(production.fixtureSha256, sha(production.fixture));
+const fixturePaths = Array.isArray(production.fixtures) ? production.fixtures : production.fixture ? [production.fixture] : [];
+assert.ok(fixturePaths.length, "production evidence has no fixture(s)");
+const fixtureEvidence = Array.isArray(production.fixtures)
+  ? fixturePaths.map((fixture) => production[fixture])
+  : [production];
+for (const evidence of fixtureEvidence) {
+  assert.ok(evidence && typeof evidence === "object", "fixture result is missing");
+  assert.equal(evidence.error, undefined);
+  assert.equal(evidence.saveReopenExact, true);
+  assert.equal(evidence.deterministicExact, true);
+}
+if (Array.isArray(production.fixtures)) {
+  assert.equal(typeof production.fixtureSha256, "object");
+  for (const fixture of fixturePaths) assert.equal(production.fixtureSha256[fixture], sha(fixture), `fixture hash drift: ${fixture}`);
+} else {
+  assert.equal(production.fixtureSha256, sha(production.fixture));
+}
 const bindingsPath = "tests/golden/WBV2/dynamic-coverage-bindings.json";
 const existing = fs.existsSync(abs(bindingsPath)) ? json(bindingsPath) : [];
 const byId = new Map(existing.map((binding) => [binding.unitId, binding]));