Add context-length sweep script for fragmentation analysis

[Beethom]

Summary

• Adds scripts/sweep_script.py: a sequential context-length sweep tool
• Sweeps prompt sizes [128 → 32768 tokens] against a local vAttention server
• Logs per-request latency and status to a timestamped JSONL file
• Supports --fail-fast to abort on first error and --output for custom log path

Test plan

• Start a local vAttention server
• Run python scripts/sweep_script.py --model <model-name>
• Verify JSONL output is generated and latency stats print at the end
• Test --fail-fast with a server that returns errors

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