Salvage deploy-subgraph disk space cleanup from #2366

[Siddharth2207]

Summary

• Salvages commit 3ac5c6c4 from PR wip on exact swap #2366 which was lost in the v5 revert (PR Revert entire v5 branch to a044f50f #2517)
• The deploy-subgraph CI job was hitting out-of-disk-space failures on the GitHub-hosted runner; adds a free-disk-space step before the Nix install to prevent this

Changes

• .github/workflows/deploy-subgraph.yaml: add jlumbroso/free-disk-space@v1.3.1 step before nixbuild/nix-quick-install-action

Test plan

• deploy-subgraph workflow completes without disk-space errors
• CI passes

🤖 Generated with Claude Code

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