Set up monorepo infra: Yarn 4 workspaces, tsc -b + dumble build, vitest
Workspaces are vendor/* (Cordis framework vendored as source) and packages/* (@deepseek-ai/dsh-* harness packages). Dev/test/demo run unbuilt via tsx + root tsconfig paths; build = tsc -b (declarations) + dumble (JS bundles); tests = vitest + vite-tsconfig-paths.
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