yaml.safe_load + safe_dump stripped every comment from inventory.yaml
on each enrollment, eroding the file's documentation value. New
_inventory_set_age_pubkey / _inventory_remove_host / _inventory_append_host
helpers do line-based edits so comments outside the modified region
survive. inventory.yaml gets its top-of-file conventions block back.
build_host_files.py round-trips cleanly (--check returns 0).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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