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/tiny/run_tiny_ultra_triad.sh

@@ -0,0 +1,23 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+# Run Tiny-Hot triad with Ultra (SLL-only) front for HAKMEM, comparing to System/mimalloc.
+# Usage: scripts/run_tiny_ultra_triad.sh [cycles]
+
+ROOT_DIR=$(cd "$(dirname "$0")/.." && pwd)
+cd "$ROOT_DIR"
+
+cycles=${1:-60000}
+
+echo "[build] system/mimalloc benches (fast + mi)"
+make -s bench_fast bench_tiny_hot_mi >/dev/null
+
+echo "[build] HAKMEM Ultra (SLL-only)"
+make -s bench_ultra >/dev/null
+
+export LD_LIBRARY_PATH="${LD_LIBRARY_PATH:-}"
+
+echo "[run] triad (Ultra HAKMEM vs System vs mimalloc)"
+SKIP_BUILD=1 bash scripts/run_tiny_hot_triad.sh "$cycles"
+
+echo "[note] Latest CSV printed above by triad runner."