feat(agents): add OpenCode 2 beta support (#21418)

* feat(agents): add OpenCode 2 beta support

Co-authored-by: Xiro The Dev <lethanhtrung.trungle@gmail.com>

* fix(opencode2): support current plugin lifecycle and session storage

* fix(opencode2): preserve lifecycle ordering and full session capture

* test(opencode2): cover setup event bridge

* test(opencode2): cover setup event bridge

* test(browser): satisfy anti-slop naming check

* test(opencode2): cover live form lifecycle

* fix(relay): preserve OMP config directory selection

* test(opencode2): avoid assertions in bridge fixture

* fix(rebase): retain OMP resume and fresh launch behavior

* test: align upstream OMP resume expectations

* test(opencode2): verify rejected form closes waiting state

---------

Co-authored-by: Xiro The Dev <lethanhtrung.trungle@gmail.com>

src/shared/opencode-launch-command.test.ts

@@ -0,0 +1,15 @@
+import { describe, expect, it } from 'vitest'
+import { isOpenCode2LaunchCommand } from './opencode-launch-command'
+
+describe('isOpenCode2LaunchCommand', () => {
+  it.each(['opencode2', '/usr/local/bin/opencode2', 'opencode2.exe', 'opencode2.cmd'])(
+    'recognizes %s',
+    (command) => {
+      expect(isOpenCode2LaunchCommand(command)).toBe(true)
+    }
+  )
+
+  it.each(['opencode', 'echo opencode2', 'opencode2-helper'])('rejects %s', (command) => {
+    expect(isOpenCode2LaunchCommand(command)).toBe(false)
+  })
+})