Debug Counters Implementation - Clean History

Major Features:
- Debug counter infrastructure for Refill Stage tracking
- Free Pipeline counters (ss_local, ss_remote, tls_sll)
- Diagnostic counters for early return analysis
- Unified larson.sh benchmark runner with profiles
- Phase 6-3 regression analysis documentation

Bug Fixes:
- Fix SuperSlab disabled by default (HAKMEM_TINY_USE_SUPERSLAB)
- Fix profile variable naming consistency
- Add .gitignore patterns for large files

Performance:
- Phase 6-3: 4.79 M ops/s (has OOM risk)
- With SuperSlab: 3.13 M ops/s (+19% improvement)

This is a clean repository without large log files.

🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>

benchmarks/scripts/comprehensive/run_random_mixed_matrix.sh

@@ -0,0 +1,57 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+# Run random-mixed bench for HAKMEM, System, mimalloc across ws/seeds and write CSV
+# Usage: scripts/run_random_mixed_matrix.sh [cycles]
+
+ROOT_DIR=$(cd "$(dirname "$0")/.." && pwd)
+cd "$ROOT_DIR"
+
+cycles=${1:-150000}
+
+echo "[build] benches (fast + random-mixed variants)"
+make -s bench_fast bench_random_mixed_hakmem bench_random_mixed_system bench_random_mixed_mi >/dev/null
+
+# Ensure LD_LIBRARY_PATH is defined (set -u safety)
+export LD_LIBRARY_PATH="${LD_LIBRARY_PATH:-}"
+MI_LIBDIR="$ROOT_DIR/mimalloc-bench/extern/mi/out/release"
+
+TS=$(date +%Y%m%d_%H%M%S)
+OUTDIR="bench_results/random_mixed_${TS}"
+mkdir -p "$OUTDIR"
+CSV="$OUTDIR/results.csv"
+echo "allocator,cycles,ws,seed,throughput_mops" > "$CSV"
+
+ws_list=(200 400 800)
+seeds=(42 1337)
+
+run_case() {
+  local bin="$1"; shift
+  local alloc="$1"; shift
+  local cyc="$1"; shift
+  local ws="$1"; shift
+  local seed="$1"; shift
+  local out
+  if [[ "$alloc" == "mimalloc" ]]; then
+    LD_LIBRARY_PATH="$LD_LIBRARY_PATH:$MI_LIBDIR" \
+      $bin "$cyc" "$ws" "$seed" | sed -n 's/^Throughput: \([0-9.][0-9.]*\) M ops.*/\1/p' >"$OUTDIR/tmp.txt" || true
+  else
+    $bin "$cyc" "$ws" "$seed" | sed -n 's/^Throughput: \([0-9.][0-9.]*\) M ops.*/\1/p' >"$OUTDIR/tmp.txt" || true
+  fi
+  out=$(cat "$OUTDIR/tmp.txt" || true)
+  if [[ -n "$out" ]]; then echo "$alloc,$cyc,$ws,$seed,$out" >> "$CSV"; fi
+}
+
+for ws in "${ws_list[@]}"; do
+  for seed in "${seeds[@]}"; do
+    echo "[run] HAKMEM ws=$ws seed=$seed cycles=$cycles"
+    run_case ./bench_random_mixed_hakmem hakmem "$cycles" "$ws" "$seed"
+    echo "[run] SYSTEM ws=$ws seed=$seed cycles=$cycles"
+    run_case ./bench_random_mixed_system system "$cycles" "$ws" "$seed"
+    echo "[run] MIMALLOC ws=$ws seed=$seed cycles=$cycles"
+    run_case ./bench_random_mixed_mi mimalloc "$cycles" "$ws" "$seed"
+  done
+done
+
+echo "[done] CSV: $CSV"
+sed -n '1,40p' "$CSV" || true