Converts the inline state maps in Is, PacketConsumer, LeaderElection, and
CircuitBreaker into structs with @type t specs. Enforced keys catch typos
on state updates and give dialyzer a concrete type to check against
instead of map() in every handle_* clause.
Is' nested login_params and packet_stats are extracted to their own
modules (Aprsme.Is.LoginParams, Aprsme.Is.PacketStats) rather than
defined inline, per the project's no-nested-modules rule.
Turned on :error_handling, :underspecs, and :unmatched_returns in
mix.exs dialyzer config. The 97 warnings this surfaced were fixed in
place rather than suppressed:
- unmatched_return (79): explicit discard with `_ = ...` for
fire-and-forget side effects (Process.cancel_timer, :ets.new,
send/2), and pattern-matched `:ok = ...` for control-plane
Phoenix.PubSub subscribe/unsubscribe/broadcast calls so a future
return-shape change fails loud.
- contract_supertype (18): tightened @spec arg and return types on
data_builder, historical_loader, url_params, packet_utils,
encoding_utils, aprs_symbol, weather_controller, packet_replay to
match each function's actual success typing.
No behavioural change. mix compile clean, 1008 tests pass, dialyzer
count is now 0.
