Add simulation README for PR cockroachdb#155516

Author: rishabh7m

simulation-readme-20251121-161822.md

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+# PR Simulation README
+
+## Simulation Details
+- **Timestamp**: 2025-11-21T16:18:22+05:30
+- **Original PR**: #155516
+- **Original Title**: workload: add mechanism to run changefeed alongside workloads
+- **Original Author**: stevendanna
+- **Original URL**: https://github.com/cockroachdb/cockroach/pull/155516
+
+## Original PR Timeline
+- **Created**: 2025-10-16T11:05:41Z
+- **Queue Entry**: N/A
+- **CI Start**: N/A
+- **CI Completion**: N/A
+- **Merged**: 2025-10-17T08:23:46Z
+
+## Simulation Purpose
+This PR is part of a merge queue vendor comparison simulation.
+It replicates the timing and behavior of the original PR for testing purposes.
+
+## Timing Information
+- **CI Wait Duration**: N/A
+- **CI Run Duration**: N/A  
+- **Total Queue Duration**: N/A
+
+---
+*Generated by pr-simulation tool at 2025-11-21T16:18:23+05:30*