move pi-mono into companion-cloud as apps/companion-os

- Copy all pi-mono source into apps/companion-os/
- Update Dockerfile to COPY pre-built binary instead of downloading from GitHub Releases
- Update deploy-staging.yml to build pi from source (bun compile) before Docker build
- Add apps/companion-os/** to path triggers
- No more cross-repo dispatch needed

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

packages/coding-agent/test/session-manager/migration.test.ts

@@ -0,0 +1,96 @@
+import { describe, expect, it } from "vitest";
+import {
+  type FileEntry,
+  migrateSessionEntries,
+} from "../../src/core/session-manager.js";
+
+describe("migrateSessionEntries", () => {
+  it("should add id/parentId to v1 entries", () => {
+    const entries: FileEntry[] = [
+      {
+        type: "session",
+        id: "sess-1",
+        timestamp: "2025-01-01T00:00:00Z",
+        cwd: "/tmp",
+      },
+      {
+        type: "message",
+        timestamp: "2025-01-01T00:00:01Z",
+        message: { role: "user", content: "hi", timestamp: 1 },
+      },
+      {
+        type: "message",
+        timestamp: "2025-01-01T00:00:02Z",
+        message: {
+          role: "assistant",
+          content: [{ type: "text", text: "hello" }],
+          api: "test",
+          provider: "test",
+          model: "test",
+          usage: { input: 1, output: 1, cacheRead: 0, cacheWrite: 0 },
+          stopReason: "stop",
+          timestamp: 2,
+        },
+      },
+    ] as FileEntry[];
+
+    migrateSessionEntries(entries);
+
+    // Header should have version set (v3 is current after hookMessage->custom migration)
+    expect((entries[0] as any).version).toBe(3);
+
+    // Entries should have id/parentId
+    const msg1 = entries[1] as any;
+    const msg2 = entries[2] as any;
+
+    expect(msg1.id).toBeDefined();
+    expect(msg1.id.length).toBe(8);
+    expect(msg1.parentId).toBeNull();
+
+    expect(msg2.id).toBeDefined();
+    expect(msg2.id.length).toBe(8);
+    expect(msg2.parentId).toBe(msg1.id);
+  });
+
+  it("should be idempotent (skip already migrated)", () => {
+    const entries: FileEntry[] = [
+      {
+        type: "session",
+        id: "sess-1",
+        version: 2,
+        timestamp: "2025-01-01T00:00:00Z",
+        cwd: "/tmp",
+      },
+      {
+        type: "message",
+        id: "abc12345",
+        parentId: null,
+        timestamp: "2025-01-01T00:00:01Z",
+        message: { role: "user", content: "hi", timestamp: 1 },
+      },
+      {
+        type: "message",
+        id: "def67890",
+        parentId: "abc12345",
+        timestamp: "2025-01-01T00:00:02Z",
+        message: {
+          role: "assistant",
+          content: [{ type: "text", text: "hello" }],
+          api: "test",
+          provider: "test",
+          model: "test",
+          usage: { input: 1, output: 1, cacheRead: 0, cacheWrite: 0 },
+          stopReason: "stop",
+          timestamp: 2,
+        },
+      },
+    ] as FileEntry[];
+
+    migrateSessionEntries(entries);
+
+    // IDs should be unchanged
+    expect((entries[1] as any).id).toBe("abc12345");
+    expect((entries[2] as any).id).toBe("def67890");
+    expect((entries[2] as any).parentId).toBe("abc12345");
+  });
+});