Build from repo root so @dbmole/core resolves; tsup bundles core into
dist while undici/MCP SDK/zod/ssh2 ship as pruned node_modules.
Mark ssh2 external in tsup: it is pulled in transitively by the bundled
core and ships an optional native crypto addon (pure-JS fallback). Inlining
would force esbuild to resolve a .node binary that need not exist on the
target; node-gyp also cannot reliably build it on alpine. Externalizing lets
ssh2 resolve from node_modules at runtime.
npm nests undici under packages/esmole-mcp/node_modules, so the runtime
stage copies both the root and the per-package node_modules.
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