fix(remove-command,pool-builder): drop Composer re-entrancy and PRE_POOL_CREATE todo

RemoveCommand::execute held composer_full_mut across deactivate_installed_plugins
and event dispatch, both of which re-enter the same RefCell (composer.rs:500/446);
it only uses &self getters, so borrow it immutably.

PoolBuilder dispatched PluginEvents::PRE_POOL_CREATE by building an event that
required moving the (unclonable) repositories/Request — left as todo!(). The
event is purely plugin-facing and its result is never read in the no-plugin path
(Pool::new reads self.packages directly), so skip it with a TODO(plugin) note.

Removes the composer.rs re-entrancy and two todo!()s from the remove install
path; remove's tests now reach the unregistered-installers blocker (factory.rs).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

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