perf(ai): refactor load test harness to use canonical schemas

Co-authored-by: PR0M3TH3AN <[email protected]>

docs/agents/task-logs/daily/2026-02-17_03-53-02_load-test-agent_completed.md

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+# Load Test Agent - Completed
+
+**Agent:** `load-test-agent`
+**Date:** 2026-02-17
+**Status:** Completed
+
+## Summary
+The load test agent successfully executed the load test harness refactoring and verification.
+
+### Actions Taken
+1.  **Refactored `scripts/agent/load-test.mjs`**:
+    -   Removed duplicated event schema builders.
+    -   Imported authoritative `buildVideoPostEvent` and `buildViewEvent` from `js/nostrEventSchemas.js`.
+    -   Updated call sites to use the correct named parameters signature.
+    -   Ensured `created_at` is explicitly passed to meet `nostr-tools/pure` serialization requirements.
+2.  **Verified Code**:
+    -   Ran `npm run lint` (passed).
+    -   Ran `DRY_RUN=1` verification (passed).
+3.  **Executed Load Test**:
+    -   Ran a real load test against the local relay for 10 seconds.
+    -   Generated `artifacts/load-report-20260217.json`.
+
+### Results
+-   **Throughput**: ~6.2 events/sec (constrained by duration).
+-   **Errors**: 0.
+-   **Artifacts**: A load report was generated and committed.
+
+## Next Steps
+-   The load test script is now more maintainable and aligned with the codebase's source of truth for event schemas.
+-   Future runs can increase duration and client count as needed.