fix: make SWEbench live progress script restart-safe

[piojanu]

Summary

• The tasks.jsonl progress tracking script counted raw lines, giving inflated totals (>500 for a 500-task benchmark) after SLURM wall-time restarts
• Updated the script to deduplicate by task_id (last entry wins) so progress is accurate across multiple restarts
• Added documentation explaining the append-only behavior of tasks.jsonl and when to use each progress file

Test plan

• Run SWEbench eval, check progress mid-run with the new script
• Kill and restart the eval, verify progress script still shows correct unique count (≤500)
• Confirm previously-errored instances that succeed on retry show as success

🤖 Generated with Claude Code

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