feat: add opencode local adapter support

server/src/__tests__/adapter-session-codecs.test.ts

@@ -1,6 +1,10 @@
 import { describe, expect, it } from "vitest";
 import { sessionCodec as claudeSessionCodec } from "@paperclipai/adapter-claude-local/server";
 import { sessionCodec as codexSessionCodec, isCodexUnknownSessionError } from "@paperclipai/adapter-codex-local/server";
+import {
+  sessionCodec as opencodeSessionCodec,
+  isOpenCodeUnknownSessionError,
+} from "@paperclipai/adapter-opencode-local/server";
 
 describe("adapter session codecs", () => {
   it("normalizes claude session params with cwd", () => {
@@ -38,6 +42,24 @@ describe("adapter session codecs", () => {
     });
     expect(codexSessionCodec.getDisplayId?.(serialized ?? null)).toBe("codex-session-1");
   });
+
+  it("normalizes opencode session params with cwd", () => {
+    const parsed = opencodeSessionCodec.deserialize({
+      sessionID: "opencode-session-1",
+      cwd: "/tmp/opencode",
+    });
+    expect(parsed).toEqual({
+      sessionId: "opencode-session-1",
+      cwd: "/tmp/opencode",
+    });
+
+    const serialized = opencodeSessionCodec.serialize(parsed);
+    expect(serialized).toEqual({
+      sessionId: "opencode-session-1",
+      cwd: "/tmp/opencode",
+    });
+    expect(opencodeSessionCodec.getDisplayId?.(serialized ?? null)).toBe("opencode-session-1");
+  });
 });
 
 describe("codex resume recovery detection", () => {
@@ -62,3 +84,20 @@ describe("codex resume recovery detection", () => {
     ).toBe(false);
   });
 });
+
+describe("opencode resume recovery detection", () => {
+  it("detects unknown session errors from opencode output", () => {
+    expect(
+      isOpenCodeUnknownSessionError(
+        "",
+        "NotFoundError: Resource not found: /Users/test/.local/share/opencode/storage/session/proj/ses_missing.json",
+      ),
+    ).toBe(true);
+    expect(
+      isOpenCodeUnknownSessionError(
+        "{\"type\":\"step_finish\",\"part\":{\"reason\":\"stop\"}}",
+        "",
+      ),
+    ).toBe(false);
+  });
+});