add competitive entry based on PR openai#761

proven 0.9581 BPB entry with full SOTA stack:
11L XSA-all, LeakyReLU(0.9)², VR, GA, EMA, score-first TTT,
multi-order n-gram backoff. ready to deploy on 8xH100.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: pablinga19

competitive_entry/README.md

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+# Competitive Entry
+
+Base: PR #761 (Score-First TTT + Multi-Order N-gram Backoff, 0.9581 BPB)
+
+## Architecture
+- 11L, 512d, GQA (8H/4KV), MLP 3x
+- LeakyReLU(0.9)², XSA on all 11 layers
+- Value Residual, Gated Attention, SmearGate
+- BigramHash(4096), Partial RoPE (16/64), LN Scale
+- EMA(0.997), warmdown=3000, int6 per-row + zstd-16
+
+## Eval
+- Sliding window stride=64
+- Multi-order n-gram backoff (orders 2-7)
+- Entropy-adaptive alpha
+- Score-first TTT (4 epochs, AdamW lr=0.0001, freeze first 2 blocks)
+
+## Run
+```bash
+SEED=1337 NGRAM_CACHE=1 TTT_ENABLED=1 \
+  torchrun --standalone --nproc_per_node=8 train_gpt.py
+```

competitive_entry/deploy.sh

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+#!/bin/bash
+set -e
+echo "=== COMPETITIVE ENTRY DEPLOY ==="
+echo "base: PR #761 (0.9581 BPB, 3-seed validated)"
+echo "start: $(date)"
+
+cd /workspace
+git clone https://github.com/openai/parameter-golf.git pg 2>&1 | tail -1
+cd pg
+pip install sentencepiece flash-attn zstandard huggingface_hub -q 2>&1 | tail -1
+python3 data/cached_challenge_fineweb.py --variant sp1024 2>&1 | tail -3
+
+# use PR #761 train_gpt.py (fetched from our fork)
+git clone -b ppmd-submission https://github.com/pablinga19/parameter-golf.git /workspace/ours 2>&1 | tail -1
+cp /workspace/ours/competitive_entry/train_gpt.py .
+
+echo "--- TRAINING (seed 1337) ---"
+SEED=1337 NGRAM_CACHE=1 torchrun --standalone --nproc_per_node=8 train_gpt.py 2>&1 | tail -15
+
+echo "--- TRAINING (seed 42) ---"
+SEED=42 NGRAM_CACHE=1 torchrun --standalone --nproc_per_node=8 train_gpt.py 2>&1 | tail -15
+
+echo "--- TRAINING (seed 7) ---"
+SEED=7 NGRAM_CACHE=1 torchrun --standalone --nproc_per_node=8 train_gpt.py 2>&1 | tail -15
+
+echo "=== DONE ==="
+echo "end: $(date)"