feat: enable envs for host process

[julio4]

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[claude]

Claude finished @julio4's task in 1m 8s —— View job

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PR Review: enable envs for host process

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Summary

The change correctly wires up the previously-ignored envs return value from applyTemplate and passes them to host processes. The TODO removal is good.

One issue found: env values don't go through the FilesMapped/VolumesMapped path substitution that args do (lines 936-950). If an env var references a docker path like /artifacts/jwt.hex, it won't be resolved to the host path. See inline comment for details and a suggested fix.