Add ${mpak.*} runtime variable substitution in mcp_config.env#68

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mgoldsborough wants to merge 3 commits into

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feat/upjack-root

Commits on Mar 29, 2026

Set UPJACK_ROOT for Upjack bundles during mpak run
mgoldsborough
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Replace Upjack-specific env logic with generic ${mpak.*} variable substitution
mgoldsborough
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Document ${mpak.*} runtime variable placeholders in manifest and CLI docs
mgoldsborough
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