fix(kamino): give T3 Connect provisioning node and libatomic

[shunkakinoki]

Summary

• dotfiles-updater fails on every Kamino worker at provisionKaminoT3Connect: ~/.bun/bin/t3 is a #!/usr/bin/env node shim and node is not on the activation PATH (/usr/bin/env: 'node': No such file or directory), so t3 connect link exits 127, set -e aborts, and make nix-switch fails. This also blocks fix(t3-connect): serve Kamino T3 servers over Tailscale #2853 from deploying.
• Add Nix nodejs to PATH and scope LD_LIBRARY_PATH with the GCC runtime to the provisioning command, since the native t3 binary links libatomic.so.1.
• Eval assertions for both.

Verification

• Reproduced on kamino1 under env -i: without node the shim fails; with node but no GCC lib it fails on libatomic.so.1; with both, t3 connect status succeeds.
• nix eval of the kamino3 activation snippet renders as expected and passes bash -n; nixfmt --check passes.
• Full eval suite and shellspec not run locally.

🤖 Generated with Claude Code

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Summary by cubic

Fixes Kamino provisioning so t3 connect runs under the unattended dotfiles-updater, which previously failed because node wasn't on PATH and libatomic.so.1 was missing.

Adds nodejs to PATH and scopes LD_LIBRARY_PATH with the GCC runtime to the provisioning command. Updates eval assertions to cover both.

^{Written for commit 2e4b1b0. Summary will update on new commits.}

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📥 Commits

Reviewing files that changed from the base of the PR and between 691658f and 2e4b1b0.

📒 Files selected for processing (2)

• named-hosts/kamino/default.nix
• tests/eval.nix

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[linear-code]

SHUN-6127

[pullfrog]

✅ No new issues found.

Reviewed changes — one commit on fix/kamino-t3-activation-runtime, adds nodejs and GCC runtime libs to the Kamino T3 Connect provisioning activation.

• named-hosts/kamino/default.nix — prepend ${pkgs.nodejs}/bin to PATH and set LD_LIBRARY_PATH with ${pkgs.stdenv.cc.cc.lib}/lib before running t3 connect link.
• tests/eval.nix — assertions verify the new PATH entry and LD_LIBRARY_PATH= are present.

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