diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 6bb5e967..c883f0a0 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -84,6 +84,7 @@ jobs:
         run: >-
           node --test
           scripts/check-actions-pinned.test.mjs
+          scripts/check-browser-milestone.test.mjs
           scripts/check-delivery-cadence.test.mjs
           scripts/check-security-gates.test.mjs
           scripts/check-tracked-ignore.test.mjs
diff --git a/.github/workflows/scheduled-qa.yml b/.github/workflows/scheduled-qa.yml
index 8d2e36ce..a40d7345 100644
--- a/.github/workflows/scheduled-qa.yml
+++ b/.github/workflows/scheduled-qa.yml
@@ -38,18 +38,23 @@ env:
 
 jobs:
   playwright:
-    name: Playwright E2E
+    name: Playwright E2E (${{ matrix.shard }}/2)
     if: >-
       github.event_name != 'pull_request' ||
       contains(github.event.pull_request.labels.*.name, 'ci:full')
     runs-on: ubuntu-latest
     timeout-minutes: 25
+    strategy:
+      fail-fast: false
+      matrix:
+        shard: [1, 2]
     steps:
       - name: Record milestone selection
         run: |
           {
             echo "### Playwright E2E milestone"
             echo
+            echo "- Shard: ${{ matrix.shard }}/2 (isolated runner, one worker)"
             echo "- Trigger: \`$GITHUB_EVENT_NAME\`"
             echo "- Reason: explicit \`ci:full\`, scheduled, or manual milestone"
           } >> "$GITHUB_STEP_SUMMARY"
@@ -81,13 +86,13 @@ jobs:
         env:
           PLAYWRIGHT_HTML_REPORT: '1'
           PLAYWRIGHT_HTML_OPEN: never
-        run: pnpm test:e2e
+        run: pnpm test:e2e --shard=${{ matrix.shard }}/2
 
       - name: Upload Playwright artifacts
         if: always()
         uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
         with:
-          name: playwright-artifacts
+          name: playwright-artifacts-${{ matrix.shard }}
           path: |
             playwright-report/
             test-results/
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 3ed10e06..7becaa70 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -326,6 +326,13 @@ Follow the existing conventions in `.eslintrc.*`, `.prettierrc`, and `tsconfig.j
   Playwright does not retry failures. Screenshots and traces from the first
   failure are retained in `test-results/` and uploaded by Scheduled QA.
 
+  Scheduled QA splits the complete browser inventory across two isolated runners,
+  each with its own server/data directory and one worker. Both shards must pass;
+  a failing shard does not cancel the other. Existing test timeouts and the
+  25-minute job limit are unchanged. Download `playwright-artifacts-1` and
+  `playwright-artifacts-2` for their separate reports and failure evidence.
+  A cancelled or incomplete shard is not a passing milestone.
+
 - **Load smoke tests** use [k6](https://k6.io/):
 
   ```bash
diff --git a/scripts/check-browser-milestone.test.mjs b/scripts/check-browser-milestone.test.mjs
new file mode 100644
index 00000000..c9e9b77a
--- /dev/null
+++ b/scripts/check-browser-milestone.test.mjs
@@ -0,0 +1,24 @@
+import assert from 'node:assert/strict';
+import { readFileSync } from 'node:fs';
+import test from 'node:test';
+
+const workflow = readFileSync(
+  new URL('../.github/workflows/scheduled-qa.yml', import.meta.url),
+  'utf8'
+);
+const browser = workflow.slice(workflow.indexOf('  playwright:'), workflow.indexOf('\n  k6:'));
+const config = readFileSync(new URL('../playwright.config.ts', import.meta.url), 'utf8');
+
+test('browser milestone uses two independent bounded shards without dropping failure evidence', () => {
+  assert.match(browser, /timeout-minutes: 25/);
+  assert.match(browser, /fail-fast: false/);
+  assert.match(browser, /shard: \[1, 2\]/);
+  assert.match(browser, /pnpm test:e2e --shard=\$\{\{ matrix\.shard \}\}\/2/);
+  assert.match(browser, /VERITAS_DATA_DIR=\$RUNNER_TEMP\/veritas-playwright-data/);
+  assert.match(browser, /name: playwright-artifacts-\$\{\{ matrix\.shard \}\}/);
+  assert.match(browser, /if: always\(\)/);
+  assert.doesNotMatch(browser, /continue-on-error: true|--retries|--workers|--grep|--max-failures/);
+  assert.match(config, /fullyParallel: false/);
+  assert.match(config, /retries: 0/);
+  assert.match(config, /workers: 1/);
+});