[tannevaled]

Adds require "action_mailer" support backed by
go-ruby-actionmailer/actionmailer
(pinned @main, f116fa6), so mailer classes compose and deliver mail with no
.rb file — mirroring the existing Mail and ActiveJob bindings.

Surface (ActionMailer::Base subclass model)

• Class DSL: default, delivery_method= / delivery_method,
  perform_deliveries=, raise_delivery_errors=, register_interceptor,
  register_observer, the shared deliveries sink, and the renderer= /
  enqueuer= injection points.
• Each mailer action method (def welcome) becomes callable as a class
  method via the method_added hook, returning an
  ActionMailer::MessageDelivery (deliver_now / deliver / deliver_later /
  message).
• The mailer instance surface a def welcome body runs against:
  mail(...), attachments (regular + attachments.inline), headers(hash).

Four Ruby-dispatch seams (all INLINE under the GVL)

Seam	Wiring
Action	the mailer method body is sent to a freshly allocated instance bound to the library *Mailer; a raise maps to an error the delivery proxy re-raises faithfully
RenderBody → Action View	sends #render to the configured Ruby renderer (renderer=, wired to the bound go-ruby-actionview in the consolidated binary; a stub in tests); a nil renderer / nil result skips the format
DeliveryMethod = test	default appends to ActionMailer::Base.deliveries; a #deliver object plugs in a custom transport
EnqueueJob → Active Job	deliver_later sends #enqueue to the configured Ruby enqueuer (enqueuer=, wired to the bound go-ruby-activejob in the consolidated binary; a stub in tests), else runs inline

Verification

• go build ./internal/vm/ → 0; classOf cases end in return (orphan scan clean).
• 100% coverage of the new files (actionmailer.go, actionmailer_bind.go):
  compose (single / alternative / related / mixed / empty), attachments
  (regular + inline), interceptors/observers, deliver_now / deliver_later
  (inline + enqueuer stub), the RenderBody + EnqueueJob seams via injected stubs,
  and the delivery-error raise paths.
• Full suite go test ./internal/vm/ ./internal/object/ → both ok.
• gofmt -l clean; go vet ./internal/vm/ → 0.
• Cross-compiles on all six 64-bit arches (amd64, arm64, riscv64, loong64, ppc64le, s390x).

🤖 Generated with Claude Code

[tannevaled]

Superseded by the wave-2 consolidation PR (single merge onto main; shared builtins/require/object_model/vm/arith/digest_bind). Work preserved verbatim; branch kept for reference.