fix(distributed): stage directory outputs

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Distributed workers cannot write to controller-local export and
quantization directories. Allocate model and data output directories on the
worker, then fetch their nested results through the active tunnel.

The binary conformance suite now proves all backend routes across a tunnel
owner and a peer relay with exact staged fixture bytes.

Assisted-by: Codex:GPT-5 [apply_patch] [exec_command]

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