Three plugins still leaked the built-in default through `<plugin>-global-<property>` after the broader raw/computed split in #8640. External tooling reading `:report --format json` for drift detection could not distinguish "set to default" from "never set" - after a `:set --global` followed by an unset, the JSON still reported the default value. The `<plugin>-global-<property>` keys now hold the raw stored value (empty when nothing has been set) and `<plugin>-computed-<property>` keys hold the effective value with per-app, global, and built-in default fallback. Every global property now has a computed sibling for shape consistency, including those whose default is empty. Internal callers in `scheduler-k3s` that previously read the default-applied global helpers now consume new `getComputed*` helpers, keeping deploy-time behavior unchanged.
The nginx-property binary's globalValue() switch returned ComputedX for
client-body-timeout, client-header-timeout, keepalive-timeout, and
lingering-timeout, leaking the per-app value into nginx:report's
global-<prop> key. Other properties in the same switch already call
GlobalX. Aligns the four with the rest. Also tightens
tests/unit/nginx-vhosts_properties.bats so the helper preserves values
containing whitespace or literal \$ across the inner /bin/bash -c, and
switches proxy-keepalive to integer values since the set subcommand
validates it via is_number.
