Add histogram summaries to comparison report

reports/net9to10/README.md

@@ -8,4 +8,48 @@ This directory contains reports detailing performance changes that occurred betw
 - Mono x64 Linux: ([Regressions](./linux-mono-tiger_regression_report.md), [Improvements](./linux-mono-tiger_improvement_report.md))
 - MonoAOT Arm64 Linux: ([Regressions](./linux-monoaot-ampere_regression_report.md), [Improvements](./linux-monoaot-ampere_improvement_report.md))
 - WASM x64 Linux: ([Regressions](./linux-wasm-tiger_regression_report.md), [Improvements](./linux-wasm-tiger_improvement_report.md))
-- WASM AOT x64 Linux (Viper): ([Regressions](./linux-wasmaot-viper_regression_report.md), [Improvements](./linux-wasmaot-viper_improvement_report.md))
+- WASM AOT x64 Linux (Viper): ([Regressions](./linux-wasmaot-viper_regression_report.md), [Improvements](./linux-wasmaot-viper_improvement_report.md))
+
+## Summary Histograms
+
+The histograms below show the distribution of performance changes across different .NET configurations, categorized by the magnitude of change. Each chart displays:
+
+- **Valid Regressions**: Performance decreases that have been confirmed and linked to specific commits
+- **Noisy Regressions**: Performance decreases that were detected but marked as potentially unreliable due to measurement noise
+- **Improvements**: Performance increases (includes both valid improvements and noisy measurements, as these have not been individually validated)
+
+**Important considerations when interpreting this data:**
+
+1. **Test coverage varies by feature**: Different .NET features have different numbers of performance tests. A single code change might appear as 1 regression or as many as 30+ regressions depending on how many tests exercise that particular feature.
+
+2. **Improvements are unvalidated**: Unlike regressions, improvements have not been individually verified, so some may be due to measurement noise rather than actual performance gains.
+
+3. **For detailed analysis**: Review the individual regression and improvement reports linked above to understand the root causes and specific changes responsible for performance impacts.
+
+### CoreCLR x64 Windows
+
+![CoreCLR x64 Windows Histogram](./windows-x64-tiger_histogram.png)
+
+### CoreCLR x64 Linux
+
+![CoreCLR x64 Linux Histogram](./linux-x64-tiger_histogram.png)
+
+### CoreCLR Arm64 Linux
+
+![CoreCLR Arm64 Linux Histogram](./linux-arm64-ampere_histogram.png)
+
+### Mono x64 Linux
+
+![Mono x64 Linux Histogram](./linux-mono-tiger_histogram.png)
+
+### MonoAOT Arm64 Linux
+
+![MonoAOT Arm64 Linux Histogram](./linux-monoaot-ampere_histogram.png)
+
+### WASM x64 Linux
+
+![WASM x64 Linux Histogram](./linux-wasm-tiger_histogram.png)
+
+### WASM AOT x64 Linux (Viper)
+
+![WASM AOT x64 Linux Histogram](./linux-wasmaot-viper_histogram.png)