luaperf evidence benches

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• evidence_lu001.lua — regenerates ../../evidence/lu-table-insert-hot.jsonl (same timer protocol).
  • Env: LU001_N, LU001_N_SMALL, LU001_SMALL_REPS, LU001_ROUNDS, LU001_WARM, EVIDENCE_DIR.
• evidence_lu002.lua — regenerates ../../evidence/lu-string-concat-hot.jsonl (Lua 5.4 os.clock(), warm=3, median of 9).
  • Env: LU002_N_DIGITS, LU002_N_CHUNK, LU002_N_SMALL, LU002_ROUNDS, LU002_WARM, EVIDENCE_DIR.
• evidence_lu003.lua — regenerates ../../evidence/lu-print-hot.jsonl (same timer protocol; _G.print → /dev/null).
  • Env: LU003_N, LU003_N_SMALL, LU003_ROUNDS, LU003_WARM, EVIDENCE_DIR.