mount ExMCP cache at HEX_HOME #273
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Delete branch "fix/ex-mcp-hex-home-20260913"
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The Elixir builder sets HEX_HOME=/opt/hex. The ExMCP plan mounted its writable Hex cache at /root/.hex, so a fresh consumer dependency fetch wrote to the root-owned /opt/hex path and failed with EACCES. Mount the cache at the configured Hex home.
Validation: the exact mount guard fails before the recipe change and passes after it; scripts/check passes.