feat: start mailbox evidence scanner

config/mailbox.example.yml

@@ -0,0 +1,31 @@
+mailbox:
+  id: return-mailbox-default
+  protocol: fixture
+  host: null
+  port: 993
+  tls: true
+  username_env: EMAIL_CONNECT_IMAP_USER
+  password_env: EMAIL_CONNECT_IMAP_PASSWORD
+  folder: INBOX
+
+source:
+  fixture_dir: tests/fixtures/mailbox
+
+scan:
+  mode: incremental
+  max_messages_per_run: 5000
+  since: null
+  include_seen: true
+  mark_seen: false
+  store_raw_headers: true
+  store_raw_body: false
+  store_raw_message_ref: true
+
+storage:
+  path: .email-connect/state.sqlite
+
+reports:
+  output_dir: reports
+  include_all_evidence: true
+  include_unknown_messages: true
+  timestamp_timezone: UTC