docs: clarify README license line

[Savid]

Minor docs tweak: clarify the README license line.

[github-actions]

🐼 Smoke eval — 8015a04: ✅ 8/8 pass

📊 Interactive report — tokens p50 16,522 · tokens/solve 20,078.

Reference points: v0.37.0 100% · master@8893a4f 100%.

question	result	tokens	tools
forky_node_coverage	✅	16,024	5
tracoor_node_coverage	✅	16,493	8
mainnet_block_arrival_p50	✅	15,227	6
list_datasources	✅	13,381	3
block_count_24h	✅	16,551	9
missed_slots_24h	✅	19,787	16
chartkit_default_arrival_distribution	✅	44,442	17
storage_upload_session_scoped	✅	18,720	14

🔭 Langfuse traces (8 runs; ⚠️ = failed)

• forky_node_coverage
• tracoor_node_coverage
• mainnet_block_arrival_p50
• list_datasources
• block_count_24h
• missed_slots_24h
• chartkit_default_arrival_distribution
• storage_upload_session_scoped

_{The report walks this branch's commits against the master baseline and the most recent release. A self-contained copy is in the run's eval-smoke-* artifact.}