Add bin/pos-config + lib/config-ui.sh: reads the '# POS_CONFIG:' headers
across tools into a unified runtime config (~/.config/linux_post_install/
<scope>.env, chmod 600). Secret masking with show/hide, digits:/num:/url:
validation, '-' clears, blank keeps; '*plugins' expands entertainment
plugin vars from entertainment-lib.sh. pos config with no scope opens a
picker (scope list when not a TTY); completion offers scopes from the
registry at runtime.
gen-docs.sh now handles category-less tools (pos-config) instead of
emitting pos-config-config; fix set -e/pipefail abort that truncated the
header registry mid-read. install.sh ships config-ui.sh.
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