fix: complete TechLog migration evidence

tests/unit/tech-log-parity-evidence.test.ts

@@ -0,0 +1,26 @@
+import { readFile } from "node:fs/promises";
+
+import { describe, expect, it } from "vitest";
+
+describe("TechLog source parity evidence harness", () => {
+  it("is a checked Node runner with fixture, response, recursive tree, and provenance coverage", async () => {
+    const [packageJson, source] = await Promise.all([
+      readFile("package.json", "utf8").then(JSON.parse),
+      readFile("tests/support/browser/verify-tech-log-source-parity.ts", "utf8"),
+    ]);
+
+    expect(packageJson.scripts["verify:tech-log-source-parity"]).toBe(
+      "node tests/support/browser/verify-tech-log-source-parity.ts",
+    );
+    expect(source).toContain("TECH_LOG_PUBLIC_FIXTURE_PATHS.map");
+    expect(source).toContain("element.childNodes");
+    expect(source).toContain("responseContractEqual");
+    expect(source).toContain("sourceChecksums(sourceRoot)");
+    expect(source).toContain("caseInventorySha256");
+    expect(source).toContain("evidenceSha256");
+    expect(source).toContain(
+      '"docs/operations/evidence/tech-log-source-parity.json"',
+    );
+    expect(source).not.toContain("tsx");
+  });
+});