v0.1.0

Initial release.

Added

• Eight mutator families over the Swoosh email surface, each reported under
  its own name and independently enable-able:
  • Mutare.Swoosh.Recipient (:swoosh_recipient) — swaps recipient classes
    (to/cc/bcc, and put_to/put_cc/put_bcc among themselves),
    deletes one recipient from literal recipient values, and weakens
    put_* → plain (append) one-directionally — replace-semantics
    declared but untested (each such mutant carries an equivalence note:
    a kill may require pre-existing recipients).
  • Mutare.Swoosh.Sender (:swoosh_sender) — swaps from ↔ reply_to
    and drops reply_to (delete — replies silently go to from).
  • Mutare.Swoosh.Subject (:swoosh_subject) — blanks the subject
    (subject(email, v) → subject(email, ""); the subject: option in
    new/1 is dropped).
  • Mutare.Swoosh.Body (:swoosh_body) — swaps html_body ↔ text_body.
  • Mutare.Swoosh.Header (:swoosh_header) — removes header/3 and drops
    entries from a headers: option in new/1.
  • Mutare.Swoosh.Attachment (:swoosh_attachment) — swaps attachment
    disposition (type: :inline ↔ :attachment) and removes the
    attachment/2 call / attachment: option entirely (delete).
  • Mutare.Swoosh.ProviderOption (:swoosh_provider_option) — removes
    put_provider_option/3 (provider template ids and dynamic template data
    are exactly the untested things).
  • Mutare.Swoosh.Deliver (:swoosh_deliver) — the marquee mutation:
    replaces Mailer.deliver/1,2 with a non-delivering {:ok, %{}} (and
    deliver!/1,2 with %{}), asking "does any test assert the email was
    actually sent?" Configurable with the application's mailer(s):
    {Mutare.Swoosh.Deliver, mailer: MyApp.Mailer}, or
    Mutare.Swoosh.all(mailer: MyApp.Mailer); inert without it.
• Every email-field family mutates both the pipeline call and the matching
  Swoosh.Email.new/1 option; calls match written qualified, aliased,
  imported, or piped.
• Ignore-variant labels throughout, so # mutare:ignore[family:label] can
  suppress one kind of mutant (e.g. [swoosh_recipient:append],
  [swoosh_deliver:deliver!]).
• Mutare.Swoosh.all/0 for splicing all families into a :mutators list;
  Mutare.Swoosh.all/1 to configure the deliver family's mailer: in place.