Add simulation README for PR cockroachdb#155531

Author: rishabh7m

simulation-readme-20251120-224204.md

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+# PR Simulation README
+
+## Simulation Details
+- **Timestamp**: 2025-11-20T22:42:04+05:30
+- **Original PR**: #155531
+- **Original Title**: identmap: use case-insensitive matching
+- **Original Author**: rafiss
+- **Original URL**: https://github.com/cockroachdb/cockroach/pull/155531
+
+## Original PR Timeline
+- **Created**: 2025-10-16T16:32:26Z
+- **Queue Entry**: N/A
+- **CI Start**: N/A
+- **CI Completion**: N/A
+- **Merged**: 2025-10-24T17:21:39Z
+
+## 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 2025-11-20T22:42:05+05:30*