chore: e3e triage

docs/implementation/ci_remediation_summary.md

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+# CI Remediation Summary
+
+**Date**: February 5, 2026
+**Task**: Stabilize E2E testing pipeline and fix workflow timeouts.
+
+## Problem
+The end-to-end (E2E) testing pipeline was experiencing significant instability, characterized by:
+1.  **Workflow Timeouts**: Shard 4 was consistently timing out (>20 minutes), obstructing the CI process.
+2.  **Missing Dependencies**: Security jobs for Firefox and WebKit were failing because they lacked the required Chromium dependency.
+3.  **Flaky Tests**:
+    -   `certificates.spec.ts` failed intermittently due to race conditions when ensuring either an empty state or a table was visible.
+    -   `crowdsec-import.spec.ts` failed due to transient locks on the backend API.
+
+## Solution
+
+### Workflow Optimization
+-   **Shard Rebalancing**: Reduced the number of shards from 4 to 3. This seemingly counter-intuitive move rebalanced the test load, preventing the specific bottlenecks that were causing Shard 4 to hang.
+-   **Dependency Fix**: Explicitly added the Chromium installation step to Firefox and WebKit security jobs to ensure all shared test utilities function correctly.
+
+### Test Logic Improvements
+-   **Robust Empty State Detection**: Replaced fragile boolean checks with Playwright's `.or()` locator pattern.
+    -   *Old*: `isVisible().catch()` (Bypassed auto-waits, led to race conditions)
+    -   *New*: `expect(locatorA.or(locatorB)).toBeVisible()` (Leverages built-in retry logic)
+-   **Resilient API Retries**: Implemented `.toPass()` for the CrowdSec import test.
+    -   This allows the test to automatically retry the import request with exponential backoff if the backend is temporarily locked or busy, significantly reducing flakes.
+
+## Results
+-   **Stability**: The "Empty State OR Table" flake in certificates is resolved.
+-   **Reliability**: CrowdSec import tests now handle transient backend states gracefully.
+-   **Performance**: CI jobs now complete within the allocated time budget with balanced shards.