perf - Add performance report for 4.2.31 [ci skip]

reports/4.2.31/perf.json

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+{
+    "tag": "4.2.31",
+    "generated_at": "2026-01-28T22:17:41Z",
+    "parent_pipeline_id": 13301,
+    "child_pipeline_id": 13303,
+    "summary": {
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+        "passed_tests": 701,
+        "failed_tests": 3,
+        "total_languages": 43,
+        "passed_languages": 40,
+        "avg_duration_seconds": 74,
+        "max_duration_seconds": 106,
+        "min_duration_seconds": 43,
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+        "fastest_language": "erlang"
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reports/4.2.31/perf.md

@@ -0,0 +1,146 @@
+# Performance Report: 4.2.31
+
+**Generated:** 2026-01-28T22:17:41Z
+**Pipeline:** [#13303](https://git.unturf.com/engineering/unturf/un-inception/-/pipelines/13303)
+
+## Summary
+
+| Metric | Value |
+|--------|-------|
+| Total Tests | 704 |
+| Passed | 701 |
+| Failed | 3 |
+| Pass Rate | 99.5% |
+| Languages | 43 |
+| Avg Duration | 74s |
+| Slowest | go (106s) |
+| Fastest | erlang (43s) |
+
+---
+
+## Test Duration by Language
+
+The primary performance metric - how long each language takes to run its full test suite (15 tests per language).
+
+![Duration by Language](chart-duration-by-language.png)
+
+**Key observations:**
+- **GO** and **RUST** are outliers at 90+ seconds
+- Most languages cluster between 20-40 seconds
+- Compiled languages (red) tend to be faster than interpreted (blue)
+- **ERLANG** is the fastest at 43 seconds
+
+---
+
+## Compiled vs Interpreted
+
+Comparing performance between compiled languages (C, Go, Rust, etc.) and interpreted languages (Python, Ruby, JavaScript, etc.).
+
+![Category Comparison](chart-category-comparison.png)
+
+**Findings:**
+- 20 compiled languages vs 22 interpreted
+- Compiled languages have lower median execution time
+- Interpreted languages show more variance (wider spread)
+- The white diamond marks the mean for each category
+
+---
+
+## Duration Distribution
+
+Histogram showing how test durations are distributed across all 43 languages.
+
+![Duration Histogram](chart-duration-histogram.png)
+
+**Distribution analysis:**
+- Most languages complete in 20-35 seconds (the peak)
+- Mean (green dashed) and median (blue dotted) are close together
+- Long tail on the right from slow outliers (go, rust)
+
+---
+
+## Speed Leaders
+
+Side-by-side comparison of the 10 slowest and 10 fastest languages.
+
+![Speed Leaders](chart-speed-leaders.png)
+
+**Slowest (left):** GO, RUST, FORTH, SCHEME, GROOVY
+**Fastest (right):** ERLANG, RAKU, PROLOG, CSHARP, DOTNET
+
+---
+
+## Queue vs Execution Time
+
+Scatter plot showing the relationship between CI queue wait time and actual test execution time.
+
+![Queue vs Execution](chart-queue-vs-execution.png)
+
+**Notes:**
+- Queue time is how long the job waited for a runner
+- Most jobs had similar queue times (clustered vertically)
+- Outliers labeled - go and rust took longest to execute regardless of queue time
+
+---
+
+## Dashboard
+
+Summary dashboard combining key metrics and visualizations.
+
+![Dashboard](chart-dashboard.png)
+
+---
+
+## Raw Data
+
+### Per-Language Performance
+
+| Language | Status | Duration |
+|----------|--------|----------|
+| go | Passed | 106s |
+| rust | Passed | 105s |
+| forth | Passed | 103s |
+| scheme | Passed | 94s |
+| groovy | Passed | 94s |
+| crystal | Passed | 92s |
+| clojure | Passed | 92s |
+| c | Passed | 92s |
+| cpp | Passed | 91s |
+| commonlisp | Passed | 91s |
+| zig | Passed | 89s |
+| deno | Passed | 89s |
+| java | Passed | 88s |
+| powershell | Passed | 87s |
+| awk | Passed | 87s |
+| cobol | Passed | 85s |
+| d | Passed | 82s |
+| kotlin | Passed | 81s |
+| tcl | Passed | 79s |
+| fortran | Passed | 78s |
+| typescript | Passed | 71s |
+| python | Passed | 70s |
+| ruby | Passed | 67s |
+| php | Passed | 67s |
+| julia | Passed | 67s |
+| haskell | Passed | 67s |
+| javascript | Passed | 64s |
+| v | Passed | 63s |
+| nim | Passed | 63s |
+| fsharp | Passed | 63s |
+| elixir | Passed | 63s |
+| dart | Passed | 63s |
+| bash | Passed | 63s |
+| ocaml | Failed | 63s |
+| r | Passed | 61s |
+| objc | Passed | 61s |
+| lua | Passed | 61s |
+| perl | Passed | 59s |
+| dotnet | Passed | 55s |
+| csharp | Passed | 55s |
+| prolog | Passed | 52s |
+| raku | Failed | 52s |
+| erlang | Failed | 43s |
+
+---
+
+*Report generated by UN Inception CI pipeline*

reports/4.2.31/pool-metrics.json

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+      },
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+      },
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+        "avg": 278.67,
+        "median": 273,
+        "stdev": 45.17
+      },
+      "sample_count": 55
+    }
+  ]
+}

reports/4.2.31/raw-pools.csv

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reports/4.2.31/raw-samples.csv

@@ -0,0 +1,76 @@
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reports/PERFORMANCE-HISTORY.md

@@ -35,3 +35,4 @@ Tracking compile and test execution times across releases.
 | 4.2.28 | 2026-01-24 | 645 | 100.0% | 116s | commonlisp | awk |
 | 4.2.29 | 2026-01-28 | 724 | 100.0% | 81s | go | groovy |
 | 4.2.30 | 2026-01-28 | 840 | 99.8% | 161s | julia | ocaml |
+| 4.2.31 | 2026-01-28 | 704 | 99.5% | 74s | go | erlang |