Move error tracker notifier files to correct namespace

config/prod.exs

@@ -15,7 +15,7 @@ config :music_library, monitoring_routes: true
 
 config :error_tracker, enabled: true
 
-config :music_library, MusicLibrary.ErrorNotifier,
+config :music_library, ErrorTracker.ErrorNotifier,
   from_email: "postmaster@mailgun.fullyforged.com",
   to_email: "claudio@fullyforged.com",
   mailer: MusicLibrary.Mailer,

docs/architecture.md

@@ -27,7 +27,7 @@ Key capabilities:
 
 ```
 MusicLibrary.Application (one_for_one)
-├── MusicLibrary.ErrorNotifier   # Telemetry-driven error email notifications
+├── ErrorTracker.ErrorNotifier    # Telemetry-driven error email notifications
 ├── MusicLibrary.Vault           # Cloak encryption vault
 ├── MusicLibrary.Repo            # Main SQLite repo
 ├── MusicLibrary.BackgroundRepo  # Oban SQLite repo (separate DB)
@@ -123,8 +123,8 @@ Last.fm schemas (separate, not Ecto-persisted to main DB):
 | `RecordChat` | Chat implementation for records (OpenAI streaming, web search enabled) |
 | `ArtistChat` | Chat implementation for artists (OpenAI streaming, uses Wikipedia/artist context) |
 | `Country` | Country code (alpha-2, alpha-3, subdivision, IETF) to flag emoji conversion |
-| `ErrorNotifier` | GenServer: attaches to ErrorTracker telemetry, throttles repeated errors, dispatches email notifications |
-| `ErrorNotifier.Email` | Builds and sends Swoosh error notification emails with stack trace formatting |
+| `ErrorTracker.ErrorNotifier` | GenServer: attaches to ErrorTracker telemetry, throttles repeated errors, dispatches email notifications |
+| `ErrorTracker.ErrorNotifier.Email` | Builds and sends Swoosh error notification emails with stack trace formatting |
 | `FormatNumber` | Number formatting utility |
 
 ---

lib/error_tracker/error_notifier.ex

@@ -1,10 +1,10 @@
-defmodule MusicLibrary.ErrorNotifier do
+defmodule ErrorTracker.ErrorNotifier do
   @moduledoc false
 
   use GenServer
   require Logger
 
-  alias MusicLibrary.ErrorNotifier.Email
+  alias ErrorTracker.ErrorNotifier.Email
 
   @cleanup_interval :timer.minutes(5)
 

lib/error_tracker/error_notifier/email.ex

@@ -1,4 +1,4 @@
-defmodule MusicLibrary.ErrorNotifier.Email do
+defmodule ErrorTracker.ErrorNotifier.Email do
   @moduledoc false
 
   import Swoosh.Email
@@ -134,6 +134,6 @@ defmodule MusicLibrary.ErrorNotifier.Email do
   end
 
   defp config do
-    Application.get_env(:music_library, MusicLibrary.ErrorNotifier, [])
+    Application.get_env(:music_library, ErrorTracker.ErrorNotifier, [])
   end
 end

lib/music_library/application.ex

@@ -13,7 +13,7 @@ defmodule MusicLibrary.Application do
     _ = Req.RateLimiter.new()
 
     children = [
-      MusicLibrary.ErrorNotifier,
+      ErrorTracker.ErrorNotifier,
       MusicLibrary.Vault,
       MusicLibrary.Repo,
       MusicLibrary.BackgroundRepo,

test/error_tracker/error_notifier_test.exs

@@ -1,9 +1,9 @@
-defmodule MusicLibrary.ErrorNotifierTest do
+defmodule ErrorTracker.ErrorNotifierTest do
   use ExUnit.Case, async: false
 
   import Swoosh.TestAssertions
 
-  alias MusicLibrary.ErrorNotifier
+  alias ErrorTracker.ErrorNotifier
 
   @config [
     from_email: "test@example.com",