test: expect filesystem Evidence materialization in the canonical snapshot

backend/test/workspace-registry.test.ts

@@ -1158,7 +1158,7 @@ test("rejects a corrupt fallback snapshot instead of returning degraded active s
 });
 
 
-test("snapshots canonical Evidence artifacts at the active commit without copying Evidence bytes", async () => {
+test("snapshots canonical Evidence artifacts at the active commit and materializes filesystem Evidence bytes", async () => {
   const remote = await fixture(withFilesystemEvidence(validYaml));
   const registryRoot = join(remote.root, "registry");
   const registry = new WorkspaceRegistry(config(registryRoot, remote.remote));
@@ -1185,23 +1185,36 @@ test("snapshots canonical Evidence artifacts at the active commit without copyin
   expect(active.revision.blob).toBe(committedBlob);
   expect(expectedFiles["psd-clinical.yaml"]).toBe(serializeWorkspaceYaml(committedDescriptor));
   expect(readdirSync(snapshotDirectory).sort()).toEqual([
-    "psd-clinical.env.example", "psd-clinical.md", "psd-clinical.yaml", "snapshot.json",
+    "psd-clinical", "psd-clinical.env.example", "psd-clinical.md", "psd-clinical.yaml", "snapshot.json",
   ]);
   expect(manifest.head).toBe(remote.initialCommit);
   expect(manifest.revisions[0]).toMatchObject({
     id: "psd-clinical", commit: remote.initialCommit, blob: committedBlob,
   });
-  expect(Object.keys(manifest.files).sort()).toEqual(Object.keys(expectedFiles).sort());
+  expect(Object.keys(manifest.files).sort()).toEqual([
+    "psd-clinical.env.example", "psd-clinical.md", "psd-clinical.yaml", "psd-clinical/evidence.manifest.json",
+  ]);
   for (const [name, contents] of Object.entries(expectedFiles)) {
     expect(readFileSync(join(snapshotDirectory, name), "utf8")).toBe(contents);
     expect(manifest.files[name]).toBe(createHash("sha256").update(contents).digest("hex"));
   }
+  // P6: the materialized Evidence tree and its digest-chained manifest.
+  const evidenceManifest = JSON.parse(readFileSync(
+    join(snapshotDirectory, "psd-clinical", "evidence.manifest.json"), "utf8",
+  ));
+  expect(evidenceManifest).toMatchObject({ workspace: "psd-clinical", commit: remote.initialCommit, entryCount: 1 });
+  expect(manifest.files["psd-clinical/evidence.manifest.json"]).toBe(
+    createHash("sha256").update(`${JSON.stringify(evidenceManifest)}\n`).digest("hex"),
+  );
+  expect(readFileSync(join(snapshotDirectory, "psd-clinical", "evidence", "guide.md"), "utf8"))
+    .toBe("guide v1\n");
   expect(JSON.stringify(manifest)).not.toContain("workspace-content/");
   expect(readdirSync(snapshotDirectory).some((name) => name === "workspace-content")).toBe(false);
   expect(readFileSync(join(remote.source, "psd-clinical/evidence/guide.md"), "utf8"))
     .toBe("guide v1\n");
 });
 
+
 test("never copies an installation secret canary into Git, generated artifacts, metadata, or errors", async () => {
   const remote = await fixture(validYaml.concat(`evidence:
   source: