CR-2026-02-25: AsciiDoc Attribute Refactor — Verification

All target attributes exist in antora.yml

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Current hardcoded values documented

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Build passes before changes (make)

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All hardcoded IPs replaced with {attribute} references

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All hardcoded hostnames replaced with {attribute} references

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Code blocks with attributes have subs=attributes+

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Shell variables escaped (${VAR}) in attribute-substituted blocks

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Build passes with no missing attribute warnings

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No undefined attributes in any converted file

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