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/src/cli/session-picker.ts

@@ -0,0 +1,56 @@
+/**
+ * TUI session selector for --resume flag
+ */
+
+import { ProcessTerminal, TUI } from "@mariozechner/pi-tui";
+import { KeybindingsManager } from "../core/keybindings.js";
+import type {
+  SessionInfo,
+  SessionListProgress,
+} from "../core/session-manager.js";
+import { SessionSelectorComponent } from "../modes/interactive/components/session-selector.js";
+
+type SessionsLoader = (
+  onProgress?: SessionListProgress,
+) => Promise<SessionInfo[]>;
+
+/** Show TUI session selector and return selected session path or null if cancelled */
+export async function selectSession(
+  currentSessionsLoader: SessionsLoader,
+  allSessionsLoader: SessionsLoader,
+): Promise<string | null> {
+  return new Promise((resolve) => {
+    const ui = new TUI(new ProcessTerminal());
+    const keybindings = KeybindingsManager.create();
+    let resolved = false;
+
+    const selector = new SessionSelectorComponent(
+      currentSessionsLoader,
+      allSessionsLoader,
+      (path: string) => {
+        if (!resolved) {
+          resolved = true;
+          ui.stop();
+          resolve(path);
+        }
+      },
+      () => {
+        if (!resolved) {
+          resolved = true;
+          ui.stop();
+          resolve(null);
+        }
+      },
+      () => {
+        ui.stop();
+        process.exit(0);
+      },
+      () => ui.requestRender(),
+      { showRenameHint: false, keybindings },
+    );
+
+    ui.addChild(selector);
+    ui.setFocus(selector.getSessionList());
+    ui.start();
+  });
+}