diff --git a/package-lock.json b/package-lock.json
index 52e58d9..488f411 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -12,6 +12,10 @@
       ],
       "devDependencies": {
         "@playwright/test": "^1.55.1",
+        "@typescript-eslint/eslint-plugin": "^8.45.0",
+        "@typescript-eslint/parser": "^8.45.0",
+        "eslint": "^9.36.0",
+        "eslint-config-prettier": "^10.1.8",
         "ethers": "^6.11.1",
         "husky": "^9.0.11",
         "playwright-mcp": "^0.0.12"
diff --git a/scripts/harb-evaluator/helpers/stake.ts b/scripts/harb-evaluator/helpers/stake.ts
new file mode 100644
index 0000000..63f898f
--- /dev/null
+++ b/scripts/harb-evaluator/helpers/stake.ts
@@ -0,0 +1,204 @@
+/**
+ * Shared staking helpers for holdout scenarios.
+ *
+ * stakeKrk   — drives the stake page UI (navigate → fill → submit → wait for Ponder).
+ * unstakeKrk — expands the active position collapse and clicks Unstake.
+ *
+ * Both helpers handle the password gate on first visit automatically.
+ */
+import type { Page } from '@playwright/test';
+import { expect } from '@playwright/test';
+import { navigateSPA } from '../../../tests/setup/navigate';
+import { getStackConfig } from '../../../tests/setup/stack';
+
+// ── Internal helpers ──────────────────────────────────────────────────────────
+
+/**
+ * Navigate to /app/stake, handling the auth guard's password gate if triggered.
+ * The guard redirects to /login when localStorage 'authentificated' is absent.
+ * After a successful login, router.push('/') causes '/' → '/stake' redirect so
+ * we end up on the stake page without a second navigateSPA call.
+ */
+async function navigateToStakePage(page: Page): Promise<void> {
+  await navigateSPA(page, '/app/stake');
+
+  // Race between the stake form and the login page to determine which route mounted.
+  // Point-in-time isVisible() is unreliable here: CSS transitions or async component
+  // setup can leave the element in the DOM but not yet "visible" right after networkidle.
+  const isLoginPage = await page
+    .getByLabel('Password')
+    .waitFor({ state: 'visible', timeout: 3_000 })
+    .then(() => true)
+    .catch(() => false);
+
+  if (isLoginPage) {
+    console.log('[stake] Password prompt detected, entering lobsterDao...');
+    await page.getByLabel('Password').fill('lobsterDao');
+    await page.getByRole('button', { name: 'Login' }).click();
+    // router.push('/') in LoginView → '/' redirects to '/stake' → stake page loads.
+    // Allow extra time for the two-hop client-side navigation to settle in slow CI.
+    await page.waitForLoadState('networkidle', { timeout: 20_000 });
+    console.log('[stake] Authenticated, stake page loading');
+  }
+}
+
+/**
+ * Poll the Ponder GraphQL API until at least one active position exists for owner.
+ * Throws if no active position appears within timeoutMs.
+ *
+ * owner must be lowercase: the e2e tests and this helper both use address.toLowerCase()
+ * to match Ponder's storage format (verified against 01-acquire-and-stake.spec.ts).
+ */
+async function waitForActivePosition(graphqlUrl: string, owner: string, timeoutMs = 30_000): Promise<void> {
+  const query = `
+    query PositionsByOwner($owner: String!) {
+      positionss(where: { owner: $owner }, limit: 5) {
+        items {
+          id
+          status
+        }
+      }
+    }
+  `;
+
+  const deadline = Date.now() + timeoutMs;
+  while (Date.now() < deadline) {
+    const resp = await fetch(graphqlUrl, {
+      method: 'POST',
+      headers: { 'content-type': 'application/json' },
+      body: JSON.stringify({ query, variables: { owner } }),
+    });
+    const payload = (await resp.json()) as {
+      data?: { positionss?: { items?: Array<{ id: string; status: string }> } };
+    };
+    const items = payload?.data?.positionss?.items ?? [];
+    const active = items.filter(p => p.status === 'Active');
+    if (active.length > 0) {
+      console.log(`[stake] Ponder indexed ${active.length} active position(s)`);
+      return;
+    }
+    console.log('[stake] Waiting for Ponder to index staking position...');
+    // eslint-disable-next-line no-restricted-syntax -- Polling with timeout: Ponder GraphQL is HTTP-only (no push). See AGENTS.md #Engineering Principles.
+    await new Promise(r => setTimeout(r, 2_000));
+  }
+  throw new Error(`No active staking position found in Ponder GraphQL within ${timeoutMs}ms`);
+}
+
+// ── Exported helpers ──────────────────────────────────────────────────────────
+
+/**
+ * Navigate to the stake page, fill the amount, select tax rate, and submit.
+ * Wallet must already be connected. App must be password-unlocked.
+ *
+ * @param page - Playwright page with injected wallet
+ * @param amount - KRK amount to stake (as string, e.g. '1000')
+ * @param taxRateIndex - Tax rate option index (0-based). Use the highest available for max tax.
+ */
+export async function stakeKrk(page: Page, amount: string, taxRateIndex: number): Promise<void> {
+  console.log(`[stake] Staking ${amount} KRK at tax rate index ${taxRateIndex}...`);
+
+  await navigateToStakePage(page);
+
+  // The Token Amount slider is the readiness signal used in the e2e test.
+  const tokenAmountSlider = page.getByRole('slider', { name: 'Token Amount' });
+  await expect(tokenAmountSlider).toBeVisible({ timeout: 15_000 });
+  console.log('[stake] Stake form loaded');
+
+  // Fill staking amount.
+  const stakeAmountInput = page.getByLabel('Staking Amount');
+  await expect(stakeAmountInput).toBeVisible({ timeout: 10_000 });
+  await stakeAmountInput.fill(amount);
+  console.log(`[stake] Filled staking amount: ${amount}`);
+
+  // Select tax rate.
+  const taxSelect = page.getByRole('combobox', { name: 'Tax' });
+  await taxSelect.selectOption({ value: String(taxRateIndex) });
+  console.log(`[stake] Tax rate index ${taxRateIndex} selected`);
+
+  // Anchored regex avoids matching the "Unstake" buttons on any expanded position cards.
+  const stakeButton = page.getByRole('main').getByRole('button', { name: /^(Snatch and )?Stake$/i });
+  await expect(stakeButton).toBeVisible({ timeout: 5_000 });
+  console.log('[stake] Clicking Stake button...');
+  await stakeButton.click();
+
+  // Wait for transaction: button cycles "Stake" → "Sign Transaction"/"Waiting" → "Stake".
+  // The intermediate states may be missed if the tx completes instantly (Anvil automine).
+  try {
+    await page
+      .getByRole('button', { name: /Sign Transaction|Waiting/i })
+      .waitFor({ state: 'visible', timeout: 5_000 });
+    console.log('[stake] Transaction initiated, waiting for completion...');
+    await page
+      .getByRole('main')
+      .getByRole('button', { name: /^(Snatch and )?Stake$/i })
+      .waitFor({ state: 'visible', timeout: 60_000 });
+    console.log('[stake] Stake transaction completed');
+  } catch {
+    console.log('[stake] Transaction state not observed (may have completed instantly)');
+  }
+
+  // Resolve the connected account address to scope the Ponder query to this wallet.
+  // Guard against an empty accounts array (locked or disconnected wallet).
+  const accountAddress = await page.evaluate(async () => {
+    const ethereum = (window as unknown as { ethereum: { request: (req: { method: string }) => Promise<string[]> } }).ethereum;
+    const accounts = await ethereum.request({ method: 'eth_accounts' });
+    if (!accounts || accounts.length === 0) {
+      throw new Error('[stake] eth_accounts returned empty array — wallet may be locked');
+    }
+    return accounts[0].toLowerCase();
+  });
+
+  // Poll Ponder GraphQL until the new position is indexed (indexing latency up to 30s).
+  const { graphqlUrl } = getStackConfig();
+  await waitForActivePosition(graphqlUrl, accountAddress);
+  console.log('[stake] ✅ Staking complete');
+}
+
+/**
+ * Navigate to an active staking position and click Unstake.
+ * Assumes the wallet has exactly one active position (simplest case).
+ *
+ * @param page - Playwright page with injected wallet
+ */
+export async function unstakeKrk(page: Page): Promise<void> {
+  console.log('[stake] Unstaking active position...');
+
+  await navigateToStakePage(page);
+
+  // Wait for the active position collapse to appear.
+  const activeCollapse = page.locator('.f-collapse-active').first();
+  await expect(activeCollapse).toBeVisible({ timeout: 15_000 });
+  console.log('[stake] Active position found');
+
+  // FCollapse starts collapsed (isShow = false). Click the toggle icon to expand.
+  // The icon carries class .toggle-collapse; clicking it fires openClose() in FCollapse.
+  const toggleIcon = activeCollapse.locator('.toggle-collapse').first();
+  await toggleIcon.click();
+  console.log('[stake] Expanded position collapse');
+
+  // The Unstake button appears in the collapsed body when unstake.state === 'Unstakeable'.
+  const unstakeButton = activeCollapse.getByRole('button', { name: /^unstake$/i });
+  await expect(unstakeButton).toBeVisible({ timeout: 10_000 });
+  console.log('[stake] Clicking Unstake...');
+  await unstakeButton.click();
+
+  // Observe the sign/waiting state if visible (may be missed on fast Anvil automine).
+  try {
+    await activeCollapse
+      .getByRole('button', { name: /Sign Transaction|Waiting/i })
+      .waitFor({ state: 'visible', timeout: 5_000 });
+    console.log('[stake] Unstake transaction initiated');
+  } catch {
+    console.log('[stake] Transaction sign/waiting state not observed (may have completed instantly)');
+  }
+
+  // Always wait for the collapse to detach — this verifies the Unstake click actually
+  // worked and the position was removed, regardless of whether the transient states
+  // were observed above.
+  // TODO: add a Ponder waitForPositionGone poll here for holdout scenarios that assert
+  //       off-chain state (e.g. status === 'Closed') immediately after unstaking.
+  await activeCollapse.waitFor({ state: 'detached', timeout: 60_000 });
+  console.log('[stake] Position removed from UI');
+
+  console.log('[stake] ✅ Unstaking complete');
+}