Add FastKV LongBench Llama run wrapper

experiments/llmlingua2/evaluation/FASTKV_LONGBENCH_LLAMA31.md

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+# FastKV LongBench + LLMLingua-2 + Llama 3.1 8B Instruct
+
+This setup runs LLMLingua-2 compression on the LongBench data stored in a sibling
+FastKV checkout, then evaluates with `meta-llama/Llama-3.1-8B-Instruct` at
+adaptive 20% and 30% prompt-token budgets.
+
+Expected checkout layout:
+
+```text
+<workdir>/FastKV
+<workdir>/LLMLingua
+```
+
+Required local data and prompt source:
+
+```text
+FastKV/data/LongBench/*.jsonl
+FastKV/eval/run_longbench.py
+```
+
+Before running, authenticate to Hugging Face with an account that has access to
+Llama 3.1 8B Instruct. Do not commit tokens.
+
+```bash
+huggingface-cli login
+```
+
+Run from either repository:
+
+```bash
+cd FastKV
+bash scripts/run_llmlingua2_llama31_8b_20_30.sh
+```
+
+or
+
+```bash
+cd LLMLingua
+bash experiments/llmlingua2/evaluation/scripts/run_fastkv_longbench_llama31_8b_20_30.sh
+```
+
+Useful overrides:
+
+```bash
+FASTKV_ROOT=/path/to/FastKV LLMLINGUA_REPO=/path/to/LLMLingua DATA_DIR=/path/to/LongBench SAVE_DIR=/path/to/results RATES="0.20 0.30" DATASETS="narrativeqa,qasper" MAX_NUM_EXAMPLES=10 bash scripts/run_llmlingua2_llama31_8b_20_30.sh
+```
+
+Default output:
+
+```text
+LLMLingua/results/fastkv_longbench_llmlingua2/llama3_1_8b_instruct/adaptive20
+LLMLingua/results/fastkv_longbench_llmlingua2/llama3_1_8b_instruct/adaptive30
+```
+
+The adaptive budget is computed per sample as a percentage of the full downstream
+prompt length after applying the FastKV LongBench prompt and chat template. The
+runner subtracts prompt overhead and passes the remaining target token count to
+LLMLingua-2 for context compression.

experiments/llmlingua2/evaluation/scripts/run_fastkv_longbench_llama31_8b_20_30.sh

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+#!/usr/bin/env bash
+set -euo pipefail
+
+SCRIPT_DIR=$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)
+LLMLINGUA_REPO=${LLMLINGUA_REPO:-$(cd "$SCRIPT_DIR/../../../.." && pwd)}
+FASTKV_ROOT=${FASTKV_ROOT:-$(cd "$LLMLINGUA_REPO/.." && pwd)/FastKV}
+
+export LLMLINGUA_REPO FASTKV_ROOT
+
+exec bash "$FASTKV_ROOT/scripts/run_llmlingua2_llama31_8b_20_30.sh"