alert_lib v1.0.2

• 1.0.2 | Mar 06 2026:
  [Fix] SMTP relay credentials no longer visible in process listing;
  _alert_email_relay uses curl -K config file (chmod 600, cleaned after
  use) instead of --user command-line argument; follows same security
  pattern as _alert_telegram_api
  [Fix] Webhook URLs containing embedded tokens (Slack incoming webhooks,
  Discord webhooks) redacted in _alert_curl_post error messages;
  new _alert_redact_url helper strips token portion from known webhook
  URL patterns before logging to stderr
  [Change] _alert_email_relay adds -s (silent) flag to curl for consistency
  with _alert_curl_post and _alert_telegram_api
  [New] Tests for SMTP config file credential hiding, URL redaction of
  Slack/Discord webhooks, and curl_post error message verification