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Add gnused to CI dependencies for lex-cli

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

+1
+1
.tangled/workflows/ci.yaml
··· 11 11 - nodejs_22 12 12 - pnpm 13 13 - chromium 14 + - gnused 14 15 15 16 environment: 16 17 PLAYWRIGHT_BROWSERS_PATH: "0"