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
- TimeHelpers.to_datetime: `cond` with match?/2 guards becomes five
function heads dispatched by input type — DateTime passes through,
NaiveDateTime anchors to UTC, integer is a millisecond Unix epoch,
binary tries ISO 8601, everything else is nil.
- PageController.health: the three-branch `cond` + inner `if db_healthy`
becomes a chain of small respond_* helpers, each pattern-matched on a
single axis (health_status, shutting_down?, db_healthy?). db_healthy?/0
isolates the rescue.
- format_uptime splits the cond into four format_uptime_parts/4 clauses.
Adds tests for the PageController actions (health 200 / 503-draining,
ready, sitemap.xml, .well-known/api-catalog, status.json). Coverage
66.81 → 67.29%.
