Remove faker, floki, igniter, ecto_psql_extras (zero usages), exvcr
(zero usages), and resend. Replace resend with Aprsme.Swoosh.ResendAdapter
using the already-present req dependency. Frees 23 packages total from
the lockfile including hackney, certifi, and the tesla dependency chain.
Fix two pre-existing test isolation bugs:
- signal_handler_test called the real ShutdownHandler.shutdown() via SIGTERM
simulation without restoring state, causing page_controller_test to see
shutting_down: true and return 503
- page_controller_test setup now resets ShutdownHandler state defensively
Graham McIntire
a377847122