Self-host Lane 1 value-grounding in 05_emit_rust: Empty{} -> Rc::new(vec![]) value-seed paired to rust_seed_host_container_base (independent slice, does NOT require the #5552 generic-alias keystone), per docs/plans/dsl-v2-defork-audit.md section 3b

[briansrls]

Auto-opened by session-dashboard for session stern-bat-782.
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