release: 0.107.2 (improvement/gate-runner)

Under a busy machine (the gate's lanes side by side, 12 busy cores) these went red at random: a press landed while the button was still busy, an answer was settled before it was asked for, a page grew past one wait's budget, a lazy chunk was transformed inside a 1 s wait, focus was taken a frame after the press. They now wait for the condition they depend on, preload the chunks they open, and the tests that do heavy work (whole-repo scans, the type-aware linter, module resets) carry an explicit budget naming that work. The whole suite four times under 12 busy-loop processes: red 4/4 before, 0/4 after.

CHANGELOG.md

@@ -7,6 +7,12 @@ edit the release notes and re-run the generator.
 
 Upgrading, pinning a version and rolling back: [docs/self-hosting.md](docs/self-hosting.md#upgrading).
 
+## 0.107.2 — 2026-10-17
+
+### New
+
+- Development: the gate script can list its checks (scripts/check.sh --list) and run just one (--only), and the backend tests run on every CPU core, each worker with its own database.
+
 ## 0.107.1 — 2026-10-16
 
 ### Fixed

VERSION

@@ -1 +1 @@
-0.107.1
+0.107.2

backend/docker-compose.test.yml

@@ -16,6 +16,9 @@ services:
       POSTGRES_DB: siftlode_test
     tmpfs:
       - /var/lib/postgresql/data  # ephemeral + fast; the schema is rebuilt per run
+    # One database per pytest-xdist worker, each through the app's own pool (5 + 10 overflow): the default 100
+    # connections would run out at 8 workers.
+    command: ["postgres", "-c", "max_connections=300"]
     healthcheck:
       test: ["CMD-SHELL", "pg_isready -U siftlode -d siftlode_test"]
       interval: 1s
@@ -37,4 +40,4 @@ services:
       - ./:/app
     working_dir: /app
     # Coverage is on demand, not in the gate: see docs/development.md.
-    command: ["python", "-m", "pytest"]
+    command: ["python", "-m", "pytest", "-n", "auto"]

backend/pytest.ini

@@ -7,4 +7,9 @@
 # not an unknown marker that quietly does nothing.
 testpaths = tests
 pythonpath = .
-addopts = -q -rs --strict-markers
+# `-p tests.db_per_worker`: under pytest-xdist (`-n`) every worker gets its own database — DATABASE_URL + `_gw<N>`,
+# created on first use — because the `db` fixture's TRUNCATE-per-test isolation assumes one process per database.
+# It is a plugin so it runs before conftest imports the app (whose settings read DATABASE_URL once). Serial: no-op.
+# The file is a verbatim copy of a shared tool (see its docstring); change the source, not the copy.
+addopts = -q -rs --strict-markers -p tests.db_per_worker
+db_per_worker_env = DATABASE_URL

backend/requirements-dev.txt

@@ -16,3 +16,6 @@ pytest-cov==7.1.0
 ruff==0.15.21
 httpx2==2.13.0
 pip-audit==2.10.1
+# pytest-xdist: the DB lane runs on every core (`-n auto` in docker-compose.test.yml); tests/db_per_worker.py gives
+# each worker its own database. Same tests, same strictness — only side by side.
+pytest-xdist==3.8.0

backend/tests/db_per_worker.py

@@ -0,0 +1,94 @@
+"""Give every pytest-xdist worker its own database, so a suite that shares one test database can run in parallel.
+
+Generic (source of truth: the memory repo's tools/pytest-parallel/db_per_worker.py); a project carries a verbatim copy
+next to its conftest — tests often run in a container that cannot see this repo — and
+`tools/pytest-parallel/sync-check.sh <copy>` reports drift. Keep the copy byte-identical; change it here.
+
+Use, as a pytest plugin (it then runs before any conftest, i.e. before the app reads its settings):
+  pytest.ini:  addopts = -p tests.db_per_worker      (the copy's import path; `python -m pytest` puts cwd on sys.path)
+               db_per_worker_env = DATABASE_URL       (the environment variable that holds the test database)
+or call `apply("<ENV VAR>")` yourself before the app is imported. The variable may hold:
+  - a Postgres URL (`postgresql://…/name`, `postgresql+psycopg://…`): the worker gets `name_gw<N>`, created from the
+    base database's server if missing (empty — the project's own schema fixture migrates it, as for one process);
+  - a SQLite URL (`sqlite:///path.db`) or a plain file path: the worker gets `path-gw<N>.db`.
+Without xdist (no PYTEST_XDIST_WORKER) or with the variable unset it changes nothing, so a serial run is unaffected.
+"""
+
+from __future__ import annotations
+
+import os
+import re
+from urllib.parse import urlsplit, urlunsplit
+
+import pytest
+
+_PG = re.compile(r"^postgres(?:ql)?(?:\+\w+)?://", re.I)
+
+
+def pytest_addoption(parser: pytest.Parser) -> None:
+    parser.addini(
+        "db_per_worker_env",
+        "env var holding the test database (a Postgres URL, SQLite URL or file path)",
+    )
+
+
+@pytest.hookimpl(tryfirst=True)
+def pytest_load_initial_conftests(early_config: pytest.Config) -> None:
+    var = early_config.getini("db_per_worker_env")
+    if var:
+        apply(str(var))
+
+
+def apply(var: str) -> str | None:
+    worker = os.environ.get("PYTEST_XDIST_WORKER")
+    value = os.environ.get(var)
+    if not worker or not value:
+        return value
+    if _PG.match(value):
+        new = _postgres(value, worker)
+    else:
+        new = _file(value, worker)
+    os.environ[var] = new
+    return new
+
+
+def _postgres(url: str, worker: str) -> str:
+    parts = urlsplit(url)
+    base = parts.path.lstrip("/")
+    name = f"{base}_{worker}"
+    if not re.fullmatch(r"\w+", name):
+        raise ValueError(f"db_per_worker: refusing an unusual database name {name!r}")
+    # The server, through the BASE database (it exists; `postgres` may not be reachable for this role).
+    plain = urlunsplit(
+        (re.sub(r"\+\w+$", "", parts.scheme), parts.netloc, parts.path, parts.query, "")
+    )
+    _create_if_missing(plain, name)
+    return urlunsplit((parts.scheme, parts.netloc, f"/{name}", parts.query, parts.fragment))
+
+
+def _create_if_missing(dsn: str, name: str) -> None:
+    try:
+        import psycopg  # psycopg 3
+
+        conn = psycopg.connect(dsn, autocommit=True)
+    except ImportError:
+        import psycopg2  # fallback for projects on psycopg2
+
+        conn = psycopg2.connect(dsn)
+        conn.autocommit = True
+    try:
+        cur = conn.cursor()
+        cur.execute("SELECT 1 FROM pg_database WHERE datname = %s", (name,))
+        if cur.fetchone() is None:
+            cur.execute(f'CREATE DATABASE "{name}"')  # name checked to be \w+ above
+    finally:
+        conn.close()
+
+
+def _file(value: str, worker: str) -> str:
+    prefix = ""
+    m = re.match(r"^(sqlite(?:\+\w+)?:///)(.*)$", value, re.I)
+    if m:
+        prefix, value = m.group(1), m.group(2)
+    root, ext = os.path.splitext(value)
+    return f"{prefix}{root}-{worker}{ext}"

docs/development.md

@@ -44,6 +44,8 @@ A change is done when this is green, from the repo root:
 bash scripts/check.sh        # every lane
 bash scripts/check.sh lint   # the static lanes only (no tests, build or audits) — the quick loop
 bash scripts/check.sh --brief          # either mode: one line per lane, output only for a red one
+bash scripts/check.sh --list           # the lane names, one per line (runs nothing)
+bash scripts/check.sh --only "vitest"  # one lane, by its exact name — never "the gate"
 bash scripts/lint-changed.sh           # ruff + eslint + prettier on the uncommitted files only
 ```
 
@@ -107,6 +109,9 @@ Coverage is on demand, never enforced and not in the gate (E35): `npm run test -
 `frontend/`, and for the backend
 `docker compose -f backend/docker-compose.test.yml run --rm test python -m pytest --cov=app` (then
 `… down -v`).
+The DB lane runs on every core (`pytest -n auto`, pytest-xdist): `tests/db_per_worker.py` gives each worker its own
+database (`siftlode_test_gw<N>`, created and migrated on first use), so the same tests run side by side. A serial
+run (no `-n`) still works and uses `siftlode_test` itself.
 The Playwright suite (`npm run e2e`) runs against the `:8080` stack built from your tree; the release
 requires it. Before an image is pushed, it is scanned with Trivy (HIGH/CRITICAL with a fix fails;
 exceptions in `.trivyignore.yaml`, each with a reason and an expiry).

frontend/src/components/Feed.countStale.dom.test.tsx

@@ -75,10 +75,12 @@ describe("Feed — the count while a new search's count loads", () => {
   it("dims the previous count and marks it busy until the new one lands", async () => {
     vi.spyOn(api, "feed").mockResolvedValue({ items: [], next_cursor: null } as never);
     let settle: (v: unknown) => void = () => {};
-    vi.spyOn(api, "feedSummary").mockImplementation(((f: FeedFilters) =>
+    const summary = vi
-      f.q === "kitchen"
+      .spyOn(api, "feedSummary")
-        ? Promise.resolve({ count: 1937, facets: {} })
+      .mockImplementation(((f: FeedFilters) =>
-        : new Promise((r) => (settle = r))) as never);
+        f.q === "kitchen"
+          ? Promise.resolve({ count: 1937, facets: {} })
+          : new Promise((r) => (settle = r))) as never);
     const qc = new QueryClient({ defaultOptions: { queries: { retry: false } } });
     qc.setQueryData(qk.me(), { id: 1, can_write: true, prefs: {} });
     const pill = () => screen.getByTestId("item-count");
@@ -91,6 +93,9 @@ describe("Feed — the count while a new search's count loads", () => {
     await waitFor(() => expect(pill().getAttribute("aria-busy")).toBe("true"));
     expect(pill().getAttribute("title")).toBe("1,937"); // still the old figure, now marked as such
 
+    // The pill turns busy in the render that changes the search, and the count is asked for in an
+    // effect after it: answer only once it has been asked, or the answer goes to no one.
+    await waitFor(() => expect(summary).toHaveBeenCalledWith(expect.objectContaining({ q: "a" })));
     settle({ count: 178991, facets: {} });
     await waitFor(() => expect(pill().getAttribute("title")).toBe("178,991"));
     expect(pill().getAttribute("aria-busy")).toBeNull();

frontend/src/components/Files.menu.dom.test.tsx

@@ -7,7 +7,7 @@
 // back home; a shared file is the owner's, so its menu only plays, saves, cuts or drops it from my
 // list. i18n is key-passthrough, so labels read as keys.
 import { useState } from "react";
-import { afterEach, describe, expect, it, vi } from "vitest";
+import { afterEach, beforeAll, describe, expect, it, vi } from "vitest";
 import {
   act,
   cleanup,
@@ -118,6 +118,17 @@ import Files from "./Files";
 import { FILES_LIST_CAP, type QueueJob } from "../lib/api";
 import { noteQueue, resetQueueWatch, useFinished } from "../lib/downloadQueue";
 
+// The page loads its dialogs lazily, and the first test to open one would pay for transforming the
+// chunk inside its own 1 s wait for the dialog — over that on a busy machine. Loaded once, up front.
+beforeAll(async () => {
+  await Promise.all([
+    import("./FilePreview"),
+    import("./ShareDialog"),
+    import("./UploadDialog"),
+    import("./VideoEditor"),
+  ]);
+}, 60_000);
+
 const file = (id: number, extra: Partial<LibraryFile> = {}): LibraryFile =>
   ({
     id,
@@ -452,7 +463,9 @@ describe("Files · my file's row", () => {
   });
 });
 
-describe("Files · a library past the list's cap", () => {
+// Its cases draw a full page of FILES_LIST_CAP rows, some of them twice (a sort, then its answer):
+// up to ~0.8 s idle, past 5 s when the full suite's workers share a busy machine.
+describe("Files · a library past the list's cap", { timeout: 30_000 }, () => {
   it("a search under the cap runs on the rows; one past it asks the server, so an old file is found", () => {
     mocks.folders = [YT];
     mocks.files = [file(1, { display_name: "Recept" }), file(2)];

frontend/src/components/FilesRail.dom.test.tsx

@@ -35,6 +35,12 @@ import FilesRail from "./FilesRail";
 import { api, type FileFolder } from "../lib/api";
 import { defaultLayout } from "../lib/panelLayout";
 
+// The share dialog is a lazy chunk, and the test that opens it would pay for transforming it inside
+// its own wait for the dialog — over that on a busy machine. Loaded once, up front.
+beforeAll(async () => {
+  await import("./ShareDialog");
+}, 60_000);
+
 beforeAll(() => {
   class Stub {
     observe() {}
@@ -251,10 +257,7 @@ describe("FilesRail · a folder shared by link", () => {
         .getAllByRole("menuitem", { hidden: true })
         .find((b) => b.textContent === "files.folder.shareLink")!,
     );
-    // The dialog is its own chunk, fetched on first use: slower than a re-render under a full run.
+    expect(await screen.findByText("downloads.share.folderLinkHint")).toBeTruthy();
-    expect(
-      await screen.findByText("downloads.share.folderLinkHint", {}, { timeout: 5000 }),
-    ).toBeTruthy();
     expect(await screen.findByDisplayValue(`${window.location.origin}/watch/f`)).toBeTruthy();
   });
 });

frontend/src/components/PlexMenu.dom.test.tsx

@@ -394,6 +394,11 @@ describe("a Plex title's menu — Add to collection", () => {
     // Retry from the keyboard: the focused button goes as the list loads, and focus must not be left
     // on <body> with the menu open — it lands on the first row that came back.
     const retry = (await screen.findByText("common.retry")).closest("button")!;
+    // The menu takes the focus a frame after it opens. Wait for that: a frame that came only after the
+    // press would put the focus back on the panel over the hand-over below — a test faster than a
+    // frame, not a reader, who cannot press a Retry they have not seen painted yet.
+    const panel = retry.closest("[data-floating-ui-portal]")!;
+    await vi.waitFor(() => expect(panel.contains(document.activeElement)).toBe(true));
     retry.focus();
     fireEvent.click(retry);
     const beta = await checkRow("Beta");

frontend/src/components/PlexPlayer.controls.dom.test.tsx

@@ -28,6 +28,11 @@ import { pushLayer, removeLayer } from "../lib/layerStack";
 
 type Media = HTMLMediaElement & { _t?: number; _paused?: boolean };
 
+// The info overlay is a lazy chunk, and the first test to open it would pay for transforming it
+// inside its own wait for the overlay — over that on a busy machine. Loaded once, up front.
+beforeAll(async () => {
+  await import("./PlexInfo");
+}, 60_000);
 beforeAll(() => {
   class Stub {
     observe() {}
@@ -504,8 +509,7 @@ describe("a collection sibling in the info overlay", () => {
     await playingAt("/media/A", 100);
     fireEvent.click(screen.getByLabelText("plex.player.more"));
     fireEvent.click(await menuItem("plex.player.infoBtn"));
-    // The overlay is a lazy chunk: its first import takes a while under the test runner.
+    const restart = await screen.findByRole("button", { name: "card.restart" });
-    const restart = await screen.findByRole("button", { name: "card.restart" }, { timeout: 5000 });
     fireEvent.click(restart);
     await waitFor(() => expect(lastStart(session)).toEqual(["B", 0]));
     expect(screen.queryByRole("heading", { name: "Saga" })).toBeNull(); // the overlay closed
@@ -526,9 +530,7 @@ describe("a collection sibling in the info overlay", () => {
       const asked = session.mock.calls.length;
       fireEvent.click(screen.getByLabelText("plex.player.more"));
       fireEvent.click(await menuItem("plex.player.infoBtn"));
-      fireEvent.click(
+      fireEvent.click(await screen.findByRole("button", { name: "card.restart" }));
-        await screen.findByRole("button", { name: "card.restart" }, { timeout: 5000 }),
-      );
       await waitFor(() => expect(video()._t).toBe(0));
       expect(session.mock.calls.length).toBe(asked); // the attached session seeks, no reload
       expect(video().paused).toBe(false);
@@ -578,7 +580,7 @@ describe("a Restart of the paused film whose session starts past 0", () => {
     act(() => void video().pause());
     fireEvent.click(screen.getByLabelText("plex.player.more"));
     fireEvent.click(await menuItem("plex.player.infoBtn"));
-    const restart = await screen.findByRole("button", { name: "card.restart" }, { timeout: 5000 });
+    const restart = await screen.findByRole("button", { name: "card.restart" });
     const plays = play.mock.calls.length;
     fireEvent.click(restart);
     await waitFor(() => expect(session.mock.calls.length).toBe(asked + 1));

frontend/src/components/authCardStates.dom.test.tsx

@@ -25,6 +25,10 @@ beforeAll(async () => {
   await import("./Welcome");
 }, 60_000);
 
+// Warm or not, each case still loads and evaluates the whole Welcome tree afresh after its module
+// reset: ~0.1 s idle, past 5 s when the full suite's workers share a busy machine (seen at 5.01 s).
+const CASE_BUDGET = 30_000;
+
 afterEach(() => {
   cleanup();
   vi.resetModules();
@@ -85,7 +89,7 @@ function refusal(
   return () => Promise.reject(new HttpError(403, "ignored", { code: "login", ...detail }));
 }
 
-describe("a refused sign-in becomes a named state", () => {
+describe("a refused sign-in becomes a named state", { timeout: CASE_BUDGET }, () => {
   it("names the address the account is on, not the one that was typed", async () => {
     const passwordLogin = vi.fn();
     const { HttpError } = await mountCard("/", { passwordLogin });
@@ -164,7 +168,7 @@ describe("a refused sign-in becomes a named state", () => {
 // password" form purely because a `#reset=` fragment was present, and only told the user after they
 // had typed one. Opening a dead reset link is ordinary — the token lives an hour, mail is slow, and
 // whoever got two mails clicks the older one.
-describe("an emailed reset link that is already finished", () => {
+describe("an emailed reset link that is already finished", { timeout: CASE_BUDGET }, () => {
   it("refuses to draw a form that cannot succeed", async () => {
     await mountCard("/#reset=dead-token", {
       checkPasswordReset: () => Promise.resolve({ ok: false }),
@@ -250,7 +254,7 @@ describe("an emailed reset link that is already finished", () => {
   });
 });
 
-describe("the access-request notice from a denied Google sign-in", () => {
+describe("the access-request notice from a denied Google sign-in", { timeout: CASE_BUDGET }, () => {
   it("names the address the request was recorded for", async () => {
     await mountCard("/#access=requested&email=nptemu%40gmail.com");
 

frontend/src/components/formAlerts.dom.test.tsx

@@ -6,7 +6,7 @@
 //
 // i18n is mocked to a key-passthrough; the API is stubbed so nothing reaches out.
 import { afterEach, describe, expect, it, vi } from "vitest";
-import { cleanup, fireEvent, render, screen } from "@testing-library/react";
+import { cleanup, fireEvent, render, screen, waitFor } from "@testing-library/react";
 
 vi.mock("react-i18next", async (importOriginal) => {
   const actual = await importOriginal<typeof import("react-i18next")>();
@@ -42,6 +42,9 @@ async function failTwice(fail: () => void, message: string) {
   fail();
   const first = await screen.findByRole("alert");
   expect(first.textContent).toBe(message);
+  // The wizard's Next is busy until its failed step returns (a tick after the message shows), and a
+  // busy button ignores a press: press again only once nothing on the form says it is working.
+  await waitFor(() => expect(document.querySelector('[aria-busy="true"]')).toBeNull());
   fail();
   const second = screen.getByRole("alert");
   expect(second.textContent).toBe(message);

frontend/src/components/ui/DataTable.progressive.dom.test.tsx

@@ -47,6 +47,15 @@ afterEach(() => {
 
 const bodyRows = () => host!.querySelectorAll("tbody tr").length;
 
+// Waits for the page to grow to `n` rows, one background step at a time: each step must come, but on
+// a busy machine all of them together can outlast one wait's budget (seen at 190 of 200).
+async function grownTo(n: number) {
+  for (let had = bodyRows(); had < n; had = bodyRows()) {
+    await waitFor(() => expect(bodyRows()).toBeGreaterThan(had));
+  }
+  expect(bodyRows()).toBe(n);
+}
+
 // Mounts synchronously, so what the DOM holds right after is the first render alone.
 function mount(rows: Row[], columns: Column<Row>[], narrowedBy = "") {
   host = document.createElement("div");
@@ -68,7 +77,7 @@ describe("DataTable — a long page mounts in steps", () => {
   it("paints its first rows at once and the rest after", async () => {
     mount(many(200), plain);
     expect(bodyRows()).toBe(FIRST_ROWS);
-    await waitFor(() => expect(bodyRows()).toBe(200));
+    await grownTo(200);
   });
 
   it("does not re-render the rows it already holds as it grows", async () => {
@@ -84,21 +93,21 @@ describe("DataTable — a long page mounts in steps", () => {
       },
     ];
     mount(many(200), counted);
-    await waitFor(() => expect(bodyRows()).toBe(200));
+    await grownTo(200);
     // The first row was drawn by the first render, not again by each step after it.
     expect(renders.get("r0")).toBe(1);
   });
 
   it("starts over from the first rows when the caller narrows them, not on new data", async () => {
     const draw = mount(many(200), plain, "");
-    await waitFor(() => expect(bodyRows()).toBe(200));
+    await grownTo(200);
     // New data for the same view (a refetch): the page keeps what it shows.
     draw(many(200), "");
     expect(bodyRows()).toBe(200);
     // A search the caller applied: the urgent render is small again.
     draw(many(150, "s"), "s");
     expect(bodyRows()).toBe(FIRST_ROWS);
-    await waitFor(() => expect(bodyRows()).toBe(150));
+    await grownTo(150);
   });
 
   // Channels turns the page to the row a priority pick moved and focuses it in the commit

frontend/src/content/release-notes/en.json

@@ -1,4 +1,12 @@
 [
+  {
+    "version": "0.107.2",
+    "date": "2026-10-17",
+    "new": [
+      "Development: the gate script can list its checks (scripts/check.sh --list) and run just one (--only), and the backend tests run on every CPU core, each worker with its own database."
+    ],
+    "fixed": []
+  },
   {
     "version": "0.107.1",
     "date": "2026-10-16",

frontend/src/content/release-notes/hu.json

@@ -1,4 +1,12 @@
 [
+  {
+    "version": "0.107.2",
+    "date": "2026-10-17",
+    "new": [
+      "Fejlesztés: a gate-szkript kilistázza az ellenőrzéseit (scripts/check.sh --list), és egyet is futtathat közülük (--only); a backend tesztjei minden processzormagon futnak, mindegyik saját adatbázissal."
+    ],
+    "fixed": []
+  },
   {
     "version": "0.107.1",
     "date": "2026-10-16",

frontend/src/lib/accountPinnedStores.dom.test.ts

@@ -33,13 +33,18 @@ beforeAll(async () => {
   await import("./api/core");
 }, 60_000);
 
+// Warm or not, each case still loads and evaluates the modules it imports afresh after its module
+// reset: tens of ms idle, but the same reload put sibling suites past 5 s when the full suite's
+// workers share a busy machine.
+const CASE_BUDGET = 30_000;
+
 beforeEach(() => {
   localStorage.clear();
   sessionStorage.clear();
   vi.resetModules(); // both stores load at import: each test needs a fresh one
 });
 
-describe("stores read at import, in a tab not yet pinned", () => {
+describe("stores read at import, in a tab not yet pinned", { timeout: CASE_BUDGET }, () => {
   it("keep the account's notification history and settings once the tab is pinned", async () => {
     localStorage.setItem("siftlode.notifications.5", JSON.stringify([entry(7, "older")]));
     localStorage.setItem("siftlode.notifSettings.5", JSON.stringify({ durationMs: 0 }));
@@ -65,7 +70,7 @@ describe("stores read at import, in a tab not yet pinned", () => {
   });
 });
 
-describe("a pinned tab pinned to another account", () => {
+describe("a pinned tab pinned to another account", { timeout: CASE_BUDGET }, () => {
   it("leaves the previous account's notices with that account", async () => {
     // BootGate moves a tab whose account was signed out elsewhere onto the one the server answers as.
     sessionStorage.setItem("siftlode.activeAccount", "4");

frontend/src/lib/api/facade.test.ts

@@ -71,7 +71,9 @@ beforeAll(async () => {
     slices[name] = slice;
   }
   api = ((await import("../api")) as { api: Slice }).api;
-});
+  // The imports above transform the whole api graph and i18n with every locale: under a ~0.6 s idle,
+  // but past the 10 s hook budget when the full suite's workers share a busy machine.
+}, 60_000);
 
 describe("api façade is a collision-free spread of domain slices", () => {
   it("defines no method name in more than one slice (object spread would silently drop one)", () => {

frontend/src/lib/buttonPrimitive.contract.test.ts

@@ -13,19 +13,25 @@ async function hits(source: string, filePath = "src/components/__probe.tsx"): Pr
 }
 
 describe("a hand-rolled button", () => {
-  it("is refused in a feature component, the lab and lib, raw or focus-safe", async () => {
+  // Each new path's first lint makes the type-aware project service load it (0.4–1 s apiece, a repeat
-    const raw = 'export const A = () => <button className="px-3">x</button>;\n';
+  // ~0): this case lints four, ~1.4 s idle, past 5 s on a busy machine.
-    expect(await hits(raw)).toBe(1);
+  it(
-    expect(await hits(raw, "src/design-lab/__probe.tsx")).toBe(1);
+    "is refused in a feature component, the lab and lib, raw or focus-safe",
-    expect(await hits(raw, "src/lib/__probe.tsx")).toBe(1);
+    { timeout: 30_000 },
-    // …and in a ui/ COMPOSITE: a pager or a side panel is built from the primitives too.
+    async () => {
-    expect(await hits(raw, "src/components/ui/Pager.tsx")).toBe(1);
+      const raw = 'export const A = () => <button className="px-3">x</button>;\n';
-    expect(
+      expect(await hits(raw)).toBe(1);
-      await hits(
+      expect(await hits(raw, "src/design-lab/__probe.tsx")).toBe(1);
-        'import { FocusSafeButton } from "./ui/FocusSafeButton";\nexport const B = () => <FocusSafeButton>x</FocusSafeButton>;\n',
+      expect(await hits(raw, "src/lib/__probe.tsx")).toBe(1);
-      ),
+      // …and in a ui/ COMPOSITE: a pager or a side panel is built from the primitives too.
-    ).toBe(1);
+      expect(await hits(raw, "src/components/ui/Pager.tsx")).toBe(1);
-  });
+      expect(
+        await hits(
+          'import { FocusSafeButton } from "./ui/FocusSafeButton";\nexport const B = () => <FocusSafeButton>x</FocusSafeButton>;\n',
+        ),
+      ).toBe(1);
+    },
+  );
 
   it("is allowed only in a control primitive, and the primitives pass everywhere", async () => {
     for (const file of ["IconButton.tsx", "SegmentedToggle.tsx", "AnchoredPopover.tsx"])

frontend/src/lib/diagnostics.dom.test.ts

@@ -33,6 +33,11 @@ beforeAll(async () => {
   await import("./api");
 }, 60_000);
 
+// Warm or not, each case still loads and evaluates the modules it imports afresh after its module
+// reset: tens of ms idle, but the same reload put sibling suites past 5 s when the full suite's
+// workers share a busy machine.
+const CASE_BUDGET = 30_000;
+
 beforeEach(() => {
   vi.useFakeTimers();
   vi.resetModules();
@@ -69,7 +74,7 @@ const raised = (level: "DEBUG" | "TRACE", hours = 24) => ({
 const codes = (batch: unknown[] | undefined) =>
   (batch ?? []).map((e) => (e as { event: string }).event);
 
-describe("diagnostics level", () => {
+describe("diagnostics level", { timeout: CASE_BUDGET }, () => {
   it("the base level at boot sets INFO, streams nothing and logs nothing", async () => {
     const d = await fresh();
     d.applyDiagnostics(

frontend/src/lib/diagnostics.session.dom.test.ts

@@ -54,6 +54,11 @@ beforeAll(async () => {
 }, 60_000);
 
 let current: typeof import("./diagnostics") | null = null;
+// Warm or not, each case still loads and evaluates the modules it imports afresh after its module
+// reset: tens of ms idle, but the same reload put sibling suites past 5 s when the full suite's
+// workers share a busy machine.
+const CASE_BUDGET = 30_000;
+
 beforeEach(() => {
   vi.useFakeTimers();
   vi.resetModules();
@@ -73,7 +78,7 @@ async function fresh() {
 
 const flat = () => sent.flat();
 
-describe("a debug session applied to the tab", () => {
+describe("a debug session applied to the tab", { timeout: CASE_BUDGET }, () => {
   it("raises the base level to its own, and tags and streams what it keeps", async () => {
     const d = await fresh();
     d.applyDiagnostics(BASE, recording("DEBUG"), () => {});

frontend/src/lib/gates.contract.test.ts

@@ -1,6 +1,7 @@
+import { execFileSync, spawnSync } from "node:child_process";
 import { createHash } from "node:crypto";
 import { readdirSync, readFileSync, writeFileSync } from "node:fs";
-import { relative } from "node:path";
+import { relative, resolve } from "node:path";
 import { fileURLToPath } from "node:url";
 import { ESLint, type Linter } from "eslint";
 import prettierConfig from "eslint-config-prettier";
@@ -375,6 +376,37 @@ describe("the gate snapshot (gates.snapshot.json)", () => {
   }, 120_000);
 });
 
+// Git for Windows' own bash: on a Windows PATH `bash` is often WSL's, which cannot run the script.
+function bash(): string {
+  if (process.platform !== "win32") return "bash";
+  const exec = execFileSync("git", ["--exec-path"], { encoding: "utf8" }).trim();
+  return resolve(exec, "../../../bin/bash.exe");
+}
+const checkSh = (...args: string[]) =>
+  spawnSync(bash(), ["scripts/check.sh", ...args], { cwd: REPO, encoding: "utf8" });
+
+// A runner that schedules lanes one by one learns them from `--list` and runs each with `--only`; a
+// lane missing from the list would be a lane it never runs, and an `--only` that passed with nothing
+// run would be a green about nothing.
+describe("the gate script's lane list (check.sh --list / --only)", () => {
+  it("lists every lane the script runs, in order", () => {
+    const declared = [...read("scripts/check.sh").matchAll(/^\s*lane "([^"]+)"/gm)].map(
+      (m) => m[1],
+    );
+    const listed = checkSh("--list");
+    expect(listed.status).toBe(0);
+    expect(listed.stdout.trim().split("\n")).toEqual(declared);
+    const lint = checkSh("lint", "--list").stdout.trim().split("\n");
+    expect(lint.length).toBeGreaterThan(0);
+    expect(declared.slice(0, lint.length)).toEqual(lint);
+  });
+  it("refuses an unknown lane instead of passing with nothing run", () => {
+    const r = checkSh("--only", "no such lane");
+    expect(r.status).toBe(2);
+    expect(r.stdout).not.toContain("green");
+  });
+});
+
 describe("the gate register (docs/gates.md)", () => {
   it("lists every ESLint rule narrowed, by scope", async () => {
     expect(missingFrom(eslintNarrowings(await linted()))).toEqual([]);
@@ -552,7 +584,10 @@ describe("the gate register (docs/gates.md)", () => {
       "[pytest]",
       "testpaths = tests",
       "pythonpath = .",
-      "addopts = -q -rs --strict-markers",
+      // `-p tests.db_per_worker` selects nothing and filters nothing: under `-n` it hands each worker its
+      // own database (DATABASE_URL + `_gw<N>`), so the same tests can run side by side
+      "addopts = -q -rs --strict-markers -p tests.db_per_worker",
+      "db_per_worker_env = DATABASE_URL",
     ]);
   });
 

frontend/src/lib/gates.snapshot.json

@@ -1232,6 +1232,7 @@
       "      POSTGRES_DB: siftlode_test",
       "    tmpfs:",
       "      - /var/lib/postgresql/data  # ephemeral + fast; the schema is rebuilt per run",
+      "    command: [\"postgres\", \"-c\", \"max_connections=300\"]",
       "    healthcheck:",
       "      test: [\"CMD-SHELL\", \"pg_isready -U siftlode -d siftlode_test\"]",
       "      interval: 1s",
@@ -1250,7 +1251,7 @@
       "    volumes:",
       "      - ./:/app",
       "    working_dir: /app",
-      "    command: [\"python\", \"-m\", \"pytest\"]"
+      "    command: [\"python\", \"-m\", \"pytest\", \"-n\", \"auto\"]"
     ],
     "frontend/.prettierignore": [
       "dist",
@@ -1298,16 +1299,24 @@
       "cd \"$(dirname \"$0\")/..\" || exit 2",
       "mode=all",
       "brief=0",
-      "for arg in \"$@\"; do",
+      "list=0",
-      "  case \"$arg\" in",
+      "only=\"\"",
-      "    all | lint) mode=\"$arg\" ;;",
+      "usage() { echo 'usage: scripts/check.sh [lint] [--brief] [--list | --only \"<lane>\"]' >&2; exit 2; }",
+      "while [ $# -gt 0 ]; do",
+      "  case \"$1\" in",
+      "    all | lint) mode=\"$1\" ;;",
       "    --brief) brief=1 ;;",
+      "    --list) list=1 ;;",
+      "    --only) [ $# -ge 2 ] || usage; only=\"$2\"; shift ;;",
       "  esac",
+      "  shift",
       "done",
+      "[ \"$list\" = 1 ] && [ -n \"$only\" ] && usage",
       "export MSYS_NO_PATHCONV=1 # Git Bash: do not rewrite the in-container paths below",
       "TESTCOMPOSE=backend/docker-compose.test.yml",
       "failed=()",
       "timings=()",
+      "ran=0",
       "ms() { date +%s%3N; }",
       "secs() { awk -v t=\"$1\" 'BEGIN { printf \"%.1f\", t / 1000 }'; }",
       "took=\"\"",
@@ -1315,7 +1324,7 @@
       "  took=\"$(secs $(($(ms) - $3)))\"",
       "  timings+=(\"$(printf '%8s s  %s' \"$took\" \"$1\")$([ \"$2\" = red ] && echo '  (red)')\")",
       "  if [ -n \"${GATE_TIMES_FILE:-}\" ]; then",
-      "    printf '%s\\t%s\\t%s\\t%s\\t%s\\t%s\\n' \"$(date -u +%FT%TZ)\" \"$mode\" \"$1\" \"$took\" \"$2\" \\",
+      "    printf '%s\\t%s\\t%s\\t%s\\t%s\\t%s\\n' \"$(date -u +%FT%TZ)\" \"${only:+only}${only:-$mode}\" \"$1\" \"$took\" \"$2\" \\",
       "      \"$(git rev-parse --short 'HEAD^{tree}' 2>/dev/null)\" >>\"$GATE_TIMES_FILE\"",
       "  fi",
       "  return 0",
@@ -1323,6 +1332,9 @@
       "lane() { # lane <name> <command…> — run it, remember a failure, never stop",
       "  local name=\"$1\" t0 result=ok",
       "  shift",
+      "  if [ \"$list\" = 1 ]; then echo \"$name\"; return 0; fi",
+      "  [ -n \"$only\" ] && [ \"$name\" != \"$only\" ] && return 0",
+      "  ran=$((ran + 1))",
       "  t0=\"$(ms)\"",
       "  if [ \"$brief\" = 0 ]; then",
       "    echo \">> $name…\"",
@@ -1406,14 +1418,21 @@
       "  lane \"pip-audit (backend lock)\" pip_audit",
       "  lane \"npm audit (production dependencies)\" frontend npm audit --omit=dev --audit-level=high",
       "fi",
+      "[ \"$list\" = 1 ] && exit 0",
+      "if [ -n \"$only\" ] && [ \"$ran\" = 0 ]; then",
+      "  echo \"no lane named '$only' in mode $mode — see: scripts/check.sh $mode --list\" >&2",
+      "  exit 2",
+      "fi",
+      "scope=\"gate ($mode)\"",
+      "[ -n \"$only\" ] && scope=\"lane '$only' only (not the gate)\"",
       "echo \">> lane times:\"",
       "printf '%s\\n' \"${timings[@]}\"",
       "echo \"$(printf '%8s' \"$(secs $(($(ms) - gate_t0)))\") s  total\"",
       "if [ ${#failed[@]} -eq 0 ]; then",
-      "  echo \">> gate ($mode): green ✓\"",
+      "  echo \">> $scope: green ✓\"",
       "  exit 0",
       "fi",
-      "echo \">> gate ($mode): RED — ${failed[*]}\" >&2",
+      "echo \">> $scope: RED — ${failed[*]}\" >&2",
       "exit 1"
     ]
   }

frontend/src/lib/inputPrimitive.contract.test.ts

@@ -14,16 +14,22 @@ async function hits(source: string, filePath = "src/components/__probe.tsx"): Pr
 }
 
 describe("a hand-rolled field", () => {
-  it("is refused anywhere outside the field primitives, text box or native control", async () => {
+  // Each new path's first lint makes the type-aware project service load it (0.4–1 s apiece, a repeat
-    const text = 'export const A = () => <input className="border px-2" />;\n';
+  // ~0): this case lints three, ~1 s idle, past 5 s on a busy machine.
-    expect(await hits(text)).toBe(1);
+  it(
-    expect(await hits(text, "src/design-lab/__probe.tsx")).toBe(1);
+    "is refused anywhere outside the field primitives, text box or native control",
-    // …and in a ui/ composite: the pager's page box is an Input too.
+    { timeout: 30_000 },
-    expect(await hits(text, "src/components/ui/Pager.tsx")).toBe(1);
+    async () => {
-    expect(await hits("export const B = () => <textarea />;\n")).toBe(1);
+      const text = 'export const A = () => <input className="border px-2" />;\n';
-    expect(await hits('export const C = () => <input type="checkbox" />;\n')).toBe(1);
+      expect(await hits(text)).toBe(1);
-    expect(await hits('export const D = () => <input type="range" />;\n')).toBe(1);
+      expect(await hits(text, "src/design-lab/__probe.tsx")).toBe(1);
-  });
+      // …and in a ui/ composite: the pager's page box is an Input too.
+      expect(await hits(text, "src/components/ui/Pager.tsx")).toBe(1);
+      expect(await hits("export const B = () => <textarea />;\n")).toBe(1);
+      expect(await hits('export const C = () => <input type="checkbox" />;\n')).toBe(1);
+      expect(await hits('export const D = () => <input type="range" />;\n')).toBe(1);
+    },
+  );
 
   it("passes in a field primitive, for a file picker, and for the primitives themselves", async () => {
     for (const file of ["Input.tsx", "NativeControls.tsx"])

frontend/src/lib/planCodes.contract.test.ts

@@ -103,7 +103,8 @@ describe("plan codes", () => {
     expect(pattern("PLAN_CODE")).toBe(PLAN_CODES.map(js).join("|"));
   });
 
-  it("are not cited in the code", () => {
+  // Reads every tracked and new file of the repo: ~0.6 s idle, past 5 s on a busy machine's disk and CPU.
+  it("are not cited in the code", { timeout: 30_000 }, () => {
     const files = tracked();
     expect(files.length).toBeGreaterThan(1000); // a scan that reads nothing is green over nothing
     const hits = files.flatMap((f) =>

frontend/src/lib/removedFeatures.contract.test.ts

@@ -38,7 +38,8 @@ function files(dir: string): string[] {
 }
 
 describe("removed features stay removed", () => {
-  it("leaves no trace of the demo account", () => {
+  // Reads every source file of the repo: ~0.4 s idle, past 5 s on a busy machine's disk and CPU.
+  it("leaves no trace of the demo account", { timeout: 30_000 }, () => {
     const hits = ROOTS.flatMap(files)
       .filter((f) => !ALLOWED.has(f))
       .flatMap((f) =>

frontend/src/lib/verifyEntry.dom.test.tsx

@@ -18,6 +18,11 @@ beforeAll(async () => {
   await import("./useVerifyEntry");
 }, 60_000);
 
+// Warm or not, each case still loads and evaluates the hook's graph afresh after its module reset:
+// ~60 ms idle, past 5 s when the full suite's workers share a busy machine — and a case cut off
+// mid-mount leaves its render behind for the next one to trip over.
+const CASE_BUDGET = 30_000;
+
 afterEach(() => {
   cleanup();
   vi.resetModules();
@@ -52,7 +57,7 @@ async function mountAt(url: string, verifyEmail: ReturnType<typeof vi.fn>) {
   return () => screen.getByTestId("outcome").textContent;
 }
 
-describe("confirming an emailed verification link", () => {
+describe("confirming an emailed verification link", { timeout: CASE_BUDGET }, () => {
   it("posts the fragment token and reports the confirmed address", async () => {
     const verifyEmail = vi.fn().mockResolvedValue({ ok: true, email: "someone@example.com" });
 
@@ -253,52 +258,56 @@ describe("confirming an emailed verification link", () => {
 // already runs the app to a URL differing only in the fragment is a same-document navigation, so
 // nothing reloads, the import-time snapshot never sees the token, and it sat unconsumed in the
 // address bar — the same silence the sprint set out to remove, wearing a different hat.
-describe("a verification link that arrives as a fragment-only navigation", () => {
+describe(
-  it("consumes a token delivered by hashchange, and clears it from the address bar", async () => {
+  "a verification link that arrives as a fragment-only navigation",
-    const verifyEmail = vi.fn().mockResolvedValue({ ok: true, email: "pasted@example.com" });
+  { timeout: CASE_BUDGET },
-    const outcome = await mountAt("/", verifyEmail);
+  () => {
-    expect(verifyEmail).not.toHaveBeenCalled();
+    it("consumes a token delivered by hashchange, and clears it from the address bar", async () => {
+      const verifyEmail = vi.fn().mockResolvedValue({ ok: true, email: "pasted@example.com" });
+      const outcome = await mountAt("/", verifyEmail);
+      expect(verifyEmail).not.toHaveBeenCalled();
 
-    await act(async () => {
+      await act(async () => {
-      window.history.replaceState(null, "", "/#verify=pasted-token");
+        window.history.replaceState(null, "", "/#verify=pasted-token");
-      window.dispatchEvent(new HashChangeEvent("hashchange"));
+        window.dispatchEvent(new HashChangeEvent("hashchange"));
-    });
-
-    expect(verifyEmail).toHaveBeenCalledWith("pasted-token");
-    expect(outcome()).toBe("ok:pasted@example.com");
-    expect(window.location.hash).toBe("");
-  });
-
-  it("replaces a standing outcome rather than leaving the previous banner up", async () => {
-    const verifyEmail = vi
-      .fn()
-      .mockResolvedValueOnce({ ok: true, email: "first@example.com" })
-      // The server's own refusal, not a bare Error: only a 400 carrying {code:"verify"} means the
-      // token is spent, and this case is about the SECOND outcome replacing the first.
-      .mockImplementationOnce(async () => {
-        const { HttpError } = await import("./api/core");
-        throw new HttpError(400, "verify", { code: "verify" });
       });
-    const outcome = await mountAt("/#verify=first-token", verifyEmail);
-    expect(outcome()).toBe("ok:first@example.com");
 
-    await act(async () => {
+      expect(verifyEmail).toHaveBeenCalledWith("pasted-token");
-      window.history.replaceState(null, "", "/#verify=spent-token");
+      expect(outcome()).toBe("ok:pasted@example.com");
-      window.dispatchEvent(new HashChangeEvent("hashchange"));
+      expect(window.location.hash).toBe("");
     });
 
-    expect(outcome()).toBe("invalid:-");
+    it("replaces a standing outcome rather than leaving the previous banner up", async () => {
-  });
+      const verifyEmail = vi
+        .fn()
+        .mockResolvedValueOnce({ ok: true, email: "first@example.com" })
+        // The server's own refusal, not a bare Error: only a 400 carrying {code:"verify"} means the
+        // token is spent, and this case is about the SECOND outcome replacing the first.
+        .mockImplementationOnce(async () => {
+          const { HttpError } = await import("./api/core");
+          throw new HttpError(400, "verify", { code: "verify" });
+        });
+      const outcome = await mountAt("/#verify=first-token", verifyEmail);
+      expect(outcome()).toBe("ok:first@example.com");
 
-  it("posts a given token once even if the same fragment arrives again", async () => {
+      await act(async () => {
-    const verifyEmail = vi.fn().mockResolvedValue({ ok: true, email: "same@example.com" });
+        window.history.replaceState(null, "", "/#verify=spent-token");
-    await mountAt("/#verify=same-token", verifyEmail);
+        window.dispatchEvent(new HashChangeEvent("hashchange"));
+      });
 
-    await act(async () => {
+      expect(outcome()).toBe("invalid:-");
-      window.history.replaceState(null, "", "/#verify=same-token");
-      window.dispatchEvent(new HashChangeEvent("hashchange"));
     });
 
-    expect(verifyEmail).toHaveBeenCalledTimes(1);
+    it("posts a given token once even if the same fragment arrives again", async () => {
-  });
+      const verifyEmail = vi.fn().mockResolvedValue({ ok: true, email: "same@example.com" });
-});
+      await mountAt("/#verify=same-token", verifyEmail);
+
+      await act(async () => {
+        window.history.replaceState(null, "", "/#verify=same-token");
+        window.dispatchEvent(new HashChangeEvent("hashchange"));
+      });
+
+      expect(verifyEmail).toHaveBeenCalledTimes(1);
+    });
+  },
+);

frontend/src/watchEntry.contract.test.ts

@@ -103,7 +103,8 @@ describe("the /watch entry", () => {
     expect(leaks).toEqual([]);
   });
 
-  it("catches a leak one import deep (the walk is not vacuous)", () => {
+  // Parses every module the whole app reaches: ~1.3 s idle, past 5 s on a busy machine.
+  it("catches a leak one import deep (the walk is not vacuous)", { timeout: 30_000 }, () => {
     // main.tsx is the app: walking it must find the app's i18n, and a page it only loads lazily.
     const app = reach(join(SRC, "main.tsx"));
     expect(app.has("src/i18n/index.ts")).toBe(true);

scripts/check.sh

@@ -9,6 +9,10 @@
 #   bash scripts/check.sh lint   the static lanes only: no tests, no build, no audits
 #   … --brief                    (either mode) a lane's output only when it fails, and only its first
 #                                error lines — for an agent, whose context the full log would flood
+#   … --list                     the lane names of that mode, one per line — runs nothing
+#   … --only "<lane>"            that one lane (an exact name from --list): a re-run of a red lane, or a
+#                                runner that schedules lanes itself. Its green is that lane's, never "the
+#                                gate"; an unknown name exits 2 rather than passing with nothing run
 #   GATE_TIMES_FILE=<file> …     also append each lane's time as a TSV row (UTC, mode, lane, seconds,
 #                                ok|red, HEAD's tree) — to compare runs; every run prints the times anyway
 #
@@ -20,18 +24,26 @@ set -u
 cd "$(dirname "$0")/.." || exit 2
 mode=all
 brief=0
-for arg in "$@"; do
+list=0
-  case "$arg" in
+only=""
-    all | lint) mode="$arg" ;;
+usage() { echo 'usage: scripts/check.sh [lint] [--brief] [--list | --only "<lane>"]' >&2; exit 2; }
+while [ $# -gt 0 ]; do
+  case "$1" in
+    all | lint) mode="$1" ;;
     --brief) brief=1 ;;
-    *) echo "usage: scripts/check.sh [lint] [--brief]" >&2; exit 2 ;;
+    --list) list=1 ;;
+    --only) [ $# -ge 2 ] || usage; only="$2"; shift ;;
+    *) usage ;;
   esac
+  shift
 done
+[ "$list" = 1 ] && [ -n "$only" ] && usage
 
 export MSYS_NO_PATHCONV=1 # Git Bash: do not rewrite the in-container paths below
 TESTCOMPOSE=backend/docker-compose.test.yml
 failed=()
 timings=()
+ran=0
 ms() { date +%s%3N; }
 secs() { awk -v t="$1" 'BEGIN { printf "%.1f", t / 1000 }'; }
 # How long each lane took: a line after the lane, a table at the end, and — when GATE_TIMES_FILE names a
@@ -42,7 +54,7 @@ timed() { # timed <name> <ok|red> <start-ms> — sets $took (no subshell: it mus
   took="$(secs $(($(ms) - $3)))"
   timings+=("$(printf '%8s s  %s' "$took" "$1")$([ "$2" = red ] && echo '  (red)')")
   if [ -n "${GATE_TIMES_FILE:-}" ]; then
-    printf '%s\t%s\t%s\t%s\t%s\t%s\n' "$(date -u +%FT%TZ)" "$mode" "$1" "$took" "$2" \
+    printf '%s\t%s\t%s\t%s\t%s\t%s\n' "$(date -u +%FT%TZ)" "${only:+only}${only:-$mode}" "$1" "$took" "$2" \
       "$(git rev-parse --short 'HEAD^{tree}' 2>/dev/null)" >>"$GATE_TIMES_FILE"
   fi
   return 0
@@ -50,6 +62,9 @@ timed() { # timed <name> <ok|red> <start-ms> — sets $took (no subshell: it mus
 lane() { # lane <name> <command…> — run it, remember a failure, never stop
   local name="$1" t0 result=ok
   shift
+  if [ "$list" = 1 ]; then echo "$name"; return 0; fi
+  [ -n "$only" ] && [ "$name" != "$only" ] && return 0
+  ran=$((ran + 1))
   t0="$(ms)"
   if [ "$brief" = 0 ]; then
     echo ">> $name…"
@@ -163,12 +178,19 @@ if [ "$mode" = all ]; then
   lane "npm audit (production dependencies)" frontend npm audit --omit=dev --audit-level=high
 fi
 
+[ "$list" = 1 ] && exit 0
+if [ -n "$only" ] && [ "$ran" = 0 ]; then
+  echo "no lane named '$only' in mode $mode — see: scripts/check.sh $mode --list" >&2
+  exit 2
+fi
+scope="gate ($mode)"
+[ -n "$only" ] && scope="lane '$only' only (not the gate)"
 echo ">> lane times:"
 printf '%s\n' "${timings[@]}"
 echo "$(printf '%8s' "$(secs $(($(ms) - gate_t0)))") s  total"
 if [ ${#failed[@]} -eq 0 ]; then
-  echo ">> gate ($mode): green ✓"
+  echo ">> $scope: green ✓"
   exit 0
 fi
-echo ">> gate ($mode): RED — ${failed[*]}" >&2
+echo ">> $scope: RED — ${failed[*]}" >&2
 exit 1