before functional changes by codex

examples/README.md

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+# diffuser Example Flows
+
+Placeholder structure.

examples/basic.flow.json

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+[
+  {"id":"diffuser_basic_tab","type":"tab","label":"diffuser basic","disabled":false,"info":"placeholder"}
+]

examples/edge.flow.json

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+[
+  {"id":"diffuser_edge_tab","type":"tab","label":"diffuser edge","disabled":false,"info":"placeholder"}
+]

examples/integration.flow.json

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+[
+  {"id":"diffuser_integration_tab","type":"tab","label":"diffuser integration","disabled":false,"info":"placeholder"}
+]

test/README.md

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+# diffuser Test Suite Layout
+
+Placeholder structure (diffuser currently has no runtime module files).

test/basic/structure-placeholder.basic.test.js

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+const test = require('node:test');
+const assert = require('node:assert/strict');
+
+test('diffuser placeholder structure exists', () => {
+  assert.equal(true, true);
+});

test/edge/structure-node.edge.test.js

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+const test = require('node:test');
+const assert = require('node:assert/strict');
+
+test('diffuser edge placeholder', () => {
+  assert.equal(true, true);
+});

test/integration/structure-examples.integration.test.js

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+const test = require('node:test');
+const assert = require('node:assert/strict');
+const fs = require('node:fs');
+const path = require('node:path');
+
+const dir = path.resolve(__dirname, '../../examples');
+
+test('diffuser placeholder example files exist', () => {
+  for (const file of ['basic.flow.json', 'integration.flow.json', 'edge.flow.json']) {
+    assert.equal(fs.existsSync(path.join(dir, file)), true);
+  }
+});