Migrate CLI E2E tests to Node.js 26

Run the CLI subprocess suites and benchmark tools as native TypeScript with
node:test, and move them under test/e2e-cli.

Update CI and Compose runners, run local smoke tests on Linux, macOS, and
Windows, and collect source-mapped CLI coverage with c8.

test/e2e-cli/ci-tasks.json

@@ -0,0 +1,18 @@
+[
+    "test:helpers",
+    "test:settings-writeback",
+    "test:remote-administration-exit-codes",
+    "test:setup-put-cat",
+    "test:mirror",
+    "test:daemon",
+    "test:daemon-startup",
+    "test:push-pull",
+    "test:decoupled-vault",
+    "test:sync-two-local",
+    "test:sync-locked-remote",
+    "test:remote-commands",
+    "test:e2e-matrix:couchdb-enc0",
+    "test:e2e-matrix:couchdb-enc1",
+    "test:e2e-matrix:minio-enc0",
+    "test:e2e-matrix:minio-enc1"
+]