Lockdown install / uninstall block

Blocks package install and uninstall while the device is booted in lockdown mode. Enable with --ldinstall on Lineout builds.


Build flag	`--ldinstall`
Property	`ro.bass.lockdown_block_install=1`

Gate

Active when both are true:

Property	Value
`ro.bass.lockdown_block_install`	`1`
`ro.boot.bliss.bootmode`	`lockdown`

Without ro.bass.lockdown_block_install=1, the hooks are no-ops.

Path	Layer
PackageInstaller UI (APK picker, uninstall dialog)	PackageInstaller app
`pm install` / `pm uninstall` (ADB / shell)	`PackageManagerShellCommand`
`PackageManager.deletePackage()` / PackageInstaller sessions	framework helpers

Admin / non-lockdown boots are unaffected.

./build.sh ... --ldinstall