feat: add jq to sol-shell

[thedavidmeister]

Adds pkgs.jq to sol-build-inputs so sol-shell has the canonical tool for extracting stable subsets of forge build artifacts via vm.ffi (the CopyArtifacts.sol pattern that float uses to commit a deterministic abi subset for downstream rust crates). Currently rain.metadata's CopyArtifacts.sol fails in sol-shell with 'No such file or directory' because jq isn't on PATH there.

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📥 Commits

Reviewing files that changed from the base of the PR and between 8db6c68 and db6bc9d.

📒 Files selected for processing (2)

• flake.nix
• test/bats/devshell/sol-shell/jq.test.bats

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch 2026-05-23-jq-in-sol-shell

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