fix(update): keep old updaters able to restart the Gateway (#142195)

fix(update): keep old updaters able to restart the Gateway (#142195)

* fix(update): preserve old updater imports across package swaps

* chore(build): keep compatibility inventory types private

* test(build): preserve generated compatibility artifacts in fixtures

* test(build): include recorded bridges in source runner fixtures

* test(build): consolidate compatibility coverage under postbuild

* fix(update): cover the supported updater compatibility window

* fix(update): resolve compatibility exports with ESM semantics