diff --git a/src/common/TrackLabButtonOptions.ts b/src/common/TrackLabButtonOptions.ts
index 02dbfa1..a605c9d 100644
--- a/src/common/TrackLabButtonOptions.ts
+++ b/src/common/TrackLabButtonOptions.ts
@@ -4,22 +4,28 @@
  * Shared flat button appearance for the sim. Rectangular and round push buttons
  * default to SceneryStack's 3-D appearance; pass these options (or spread them
  * into nested button options) for a flat look everywhere.
+ *
+ * Template-owned toolkit: each sim uses only some of these, so every export is tagged
+ * `@public` to tell dead-code checkers (knip) that an unused one is not dead code.
  */
 
 import type { PlayPauseStepButtonGroupOptions, TimeControlNodeOptions } from "scenerystack/scenery-phet";
 import { ButtonNode, type ComboBoxOptions } from "scenerystack/sun";
 import TrackLabColors from "../TrackLabColors.js";
 
+/** @public */
 export const FLAT_BUTTON_APPEARANCE_OPTIONS = {
   buttonAppearanceStrategy: ButtonNode.FlatAppearanceStrategy,
 } as const;
 
-/** Text on flat push buttons and combo-box items (always on a light control surface). */
+/** Text on flat push buttons and combo-box items (always on a light control surface). @public */
 export const LIGHT_SURFACE_TEXT_FILL = TrackLabColors.controlSurfaceTextColorProperty;
 
 /**
  * Combo-box chrome for panels. Item labels must use {@link LIGHT_SURFACE_TEXT_FILL}, not
  * {@link TrackLabColors.textColorProperty} — that color is for labels on the dark panel fill.
+ *
+ * @public
  */
 export const SIM_COMBO_BOX_OPTIONS = {
   buttonFill: TrackLabColors.controlSurfaceColorProperty,
@@ -28,13 +34,13 @@ export const SIM_COMBO_BOX_OPTIONS = {
   listStroke: TrackLabColors.panelBorderColorProperty,
 } satisfies Pick<ComboBoxOptions, "buttonFill" | "listFill" | "buttonStroke" | "listStroke">;
 
-/** Options for RectangularPushButton and NumberControl arrow buttons. */
-export const FLAT_RECTANGULAR_BUTTON_OPTIONS = FLAT_BUTTON_APPEARANCE_OPTIONS;
+/** Options for RectangularPushButton and NumberControl arrow buttons. @public */
+export const FLAT_RECTANGULAR_BUTTON_OPTIONS = { ...FLAT_BUTTON_APPEARANCE_OPTIONS } as const;
 
-/** Options for ResetAllButton (extends RoundPushButton). */
-export const FLAT_RESET_ALL_BUTTON_OPTIONS = FLAT_BUTTON_APPEARANCE_OPTIONS;
+/** Options for ResetAllButton (extends RoundPushButton). @public */
+export const FLAT_RESET_ALL_BUTTON_OPTIONS = { ...FLAT_BUTTON_APPEARANCE_OPTIONS } as const;
 
-/** Nested options for TimeControlNode play / pause / step round buttons. */
+/** Nested options for TimeControlNode play / pause / step round buttons. @public */
 export const FLAT_PLAY_PAUSE_STEP_BUTTON_OPTIONS = {
   playPauseButtonOptions: FLAT_BUTTON_APPEARANCE_OPTIONS,
   stepForwardButtonOptions: FLAT_BUTTON_APPEARANCE_OPTIONS,
@@ -44,6 +50,8 @@ export const FLAT_PLAY_PAUSE_STEP_BUTTON_OPTIONS = {
 /**
  * Speed radio labels for TimeControlNode. SceneryStack Text defaults to black, which
  * is low-contrast on the sim's dark Default-mode panels.
+ *
+ * @public
  */
 export const TIME_CONTROL_SPEED_RADIO_OPTIONS = {
   speedRadioButtonGroupOptions: {
diff --git a/tests/fuzz/fuzz.spec.ts b/tests/fuzz/fuzz.spec.ts
index db20e4a..c358093 100644
--- a/tests/fuzz/fuzz.spec.ts
+++ b/tests/fuzz/fuzz.spec.ts
@@ -94,7 +94,7 @@ async function runFuzz(page: Page, fuzzUrl: string): Promise<void> {
     await page.waitForTimeout(waitTime);
     elapsed += waitTime;
     try {
-      await page.evaluate(() => window.document.hasFocus);
+      await page.evaluate(() => window.document.hasFocus());
     } catch {
       break;
     }
diff --git a/tests/helpers/memoryLeak.ts b/tests/helpers/memoryLeak.ts
index f086253..03a8b64 100644
--- a/tests/helpers/memoryLeak.ts
+++ b/tests/helpers/memoryLeak.ts
@@ -13,6 +13,7 @@
 
 import { describe, expect, it } from "vitest";
 
+/** @public */
 export type DisposableObject = { dispose(): void };
 
 export type DisposalCase = {
@@ -34,6 +35,8 @@ export type DisposalCase = {
  * avoids the WeakRef macrotask-liveness pin. Without refs the loop always runs all
  * passes, which on a slow gc() can exceed the Vitest testTimeout — pass refs when
  * you have them.
+ *
+ * @public
  */
 export async function forceGC(earlyExitRefs?: WeakRef<object> | readonly WeakRef<object>[]): Promise<void> {
   const refs = earlyExitRefs === undefined ? [] : Array.isArray(earlyExitRefs) ? earlyExitRefs : [earlyExitRefs];
@@ -49,7 +52,7 @@ export async function forceGC(earlyExitRefs?: WeakRef<object> | readonly WeakRef
   }
 }
 
-/** Create, dispose, and return a WeakRef to the disposed instance. */
+/** Create, dispose, and return a WeakRef to the disposed instance. @public */
 export function createAndDispose(create: () => DisposableObject): WeakRef<object> {
   const instance = create();
   const ref = new WeakRef<object>(instance);
diff --git a/tests/setup.ts b/tests/setup.ts
index 4eca38e..30072ca 100644
--- a/tests/setup.ts
+++ b/tests/setup.ts
@@ -167,6 +167,8 @@ if (typeof globalThis.Worker === "undefined") {
 // its real type is a large overload union (widened further by @webgpu/types),
 // and a spread argument cannot be applied to an overload union.
 type LooseGetContext = (this: HTMLCanvasElement, contextId: string, ...args: unknown[]) => unknown;
+// Detached on purpose: it is only ever invoked as `origGetContext.call(this, …)` below.
+// oxlint-disable-next-line typescript/unbound-method
 const origGetContext = HTMLCanvasElement.prototype.getContext as unknown as LooseGetContext;
 HTMLCanvasElement.prototype.getContext = function (this: HTMLCanvasElement, contextId: string, ...args: unknown[]) {
   if (contextId === "2d") {