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/tui/test/overlay-short-content.test.ts

@@ -0,0 +1,60 @@
+import assert from "node:assert";
+import { describe, it } from "node:test";
+import { type Component, TUI } from "../src/tui.js";
+import { VirtualTerminal } from "./virtual-terminal.js";
+
+class SimpleContent implements Component {
+  constructor(private lines: string[]) {}
+  render(): string[] {
+    return this.lines;
+  }
+  invalidate() {}
+}
+
+class SimpleOverlay implements Component {
+  render(): string[] {
+    return ["OVERLAY_TOP", "OVERLAY_MID", "OVERLAY_BOT"];
+  }
+  invalidate() {}
+}
+
+describe("TUI overlay with short content", () => {
+  it("should render overlay when content is shorter than terminal height", async () => {
+    // Terminal has 24 rows, but content only has 3 lines
+    const terminal = new VirtualTerminal(80, 24);
+    const tui = new TUI(terminal);
+
+    // Only 3 lines of content
+    tui.addChild(new SimpleContent(["Line 1", "Line 2", "Line 3"]));
+
+    // Show overlay centered - should be around row 10 in a 24-row terminal
+    const overlay = new SimpleOverlay();
+    tui.showOverlay(overlay);
+
+    // Trigger render
+    tui.start();
+    await new Promise((r) => process.nextTick(r));
+    await terminal.flush();
+
+    const viewport = terminal.getViewport();
+    const hasOverlay = viewport.some((line) => line.includes("OVERLAY"));
+
+    console.log("Terminal rows:", terminal.rows);
+    console.log("Content lines: 3");
+    console.log("Overlay visible:", hasOverlay);
+
+    if (!hasOverlay) {
+      console.log("\nViewport contents:");
+      for (let i = 0; i < viewport.length; i++) {
+        console.log(`  [${i}]: "${viewport[i]}"`);
+      }
+    }
+
+    assert.ok(
+      hasOverlay,
+      "Overlay should be visible when content is shorter than terminal",
+    );
+
+    tui.stop();
+  });
+});