Initial public release v0.0.1.alpha2

opencode-rails — production-grade Rails integration for OpenCode.

Rails companion to opencode-ruby. ActiveRecord-aware session lifecycle
(idempotent ensure!/recreate!/abort! with row-level locks), a Turn
orchestrator driving the Reply state machine and recovering from
session-not-found, an artifact pipeline backed by ActiveStorage,
sandbox seeding, and tool-display value objects for Turbo Stream
broadcasts. Drop into any Rails 7.1+ app that wants production-grade
OpenCode streaming without rolling boilerplate.

What this version ships:
  - Opencode::Session (AR-coupled lifecycle, row-level locks)
  - Opencode::Turn (Reply state machine, session-not-found recovery)
  - Opencode::Exchange (one turn = one request/response unit)
  - Opencode::Impostor (deterministic mock for tests)
  - Opencode::Sandbox / SandboxFile (per-session FS scratch space)
  - Opencode::Transform (host-rendered artifact pipeline)
  - Opencode::Artifact / MessageArtifacts (ActiveStorage-backed)
  - Opencode::UploadedFilesPrompt (system-prompt builder)
  - Opencode::ToolDisplay (Turbo Stream value objects)
  - Opencode::ErrorReporter (pluggable adapter — Honeybadger/Sentry/etc.)
  - examples/rails_integration.rb — canonical wiring blueprint

53 smoke tests. CI on Ruby 3.2/3.3/3.4.

Ruby >= 3.2. Runtime deps: opencode-ruby = 0.0.1.alpha2,
activerecord/activestorage/activesupport >= 7.1, < 9.0.

See CHANGELOG.md for the alpha1 -> alpha2 delta.

test/opencode/exchange_test.rb

@@ -0,0 +1,26 @@
+# frozen_string_literal: true
+
+require "test_helper"
+
+# Smoke test for Opencode::Exchange — verifies it instantiates, can be
+# given empty input, and exposes the public surface (`tool_artifacts`).
+# Deeper behavioral tests live in the host application
+# (test/lib/opencode/rails/exchange_test.rb) where AR fixtures, real
+# wire shapes, and the apply-patch event stream are available.
+class Opencode::ExchangeTest < Minitest::Test
+  def test_initializes_with_empty_messages
+    exchange = Opencode::Exchange.new([])
+    assert_equal [], exchange.tool_artifacts
+  end
+
+  def test_initializes_with_nil_messages_via_array_coerce
+    exchange = Opencode::Exchange.new(nil)
+    assert_equal [], exchange.tool_artifacts
+  end
+
+  def test_tool_artifacts_supports_exclude_kwarg
+    exchange = Opencode::Exchange.new([])
+    # Should not raise when given an exclude list against empty input.
+    assert_equal [], exchange.tool_artifacts(exclude: %w[notes.md])
+  end
+end