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/rpc-example.ts

@@ -0,0 +1,91 @@
+import { dirname, join } from "node:path";
+import * as readline from "node:readline";
+import { fileURLToPath } from "node:url";
+import { RpcClient } from "../src/modes/rpc/rpc-client.js";
+
+const __dirname = dirname(fileURLToPath(import.meta.url));
+
+/**
+ * Interactive example of using coding-agent via RpcClient.
+ * Usage: npx tsx test/rpc-example.ts
+ */
+
+async function main() {
+  const client = new RpcClient({
+    cliPath: join(__dirname, "../dist/cli.js"),
+    provider: "anthropic",
+    model: "claude-sonnet-4-20250514",
+    args: ["--no-session"],
+  });
+
+  // Stream events to console
+  client.onEvent((event) => {
+    if (event.type === "message_update") {
+      const { assistantMessageEvent } = event;
+      if (
+        assistantMessageEvent.type === "text_delta" ||
+        assistantMessageEvent.type === "thinking_delta"
+      ) {
+        process.stdout.write(assistantMessageEvent.delta);
+      }
+    }
+
+    if (event.type === "tool_execution_start") {
+      console.log(`\n[Tool: ${event.toolName}]`);
+    }
+
+    if (event.type === "tool_execution_end") {
+      console.log(
+        `[Result: ${JSON.stringify(event.result).slice(0, 200)}...]\n`,
+      );
+    }
+  });
+
+  await client.start();
+
+  const state = await client.getState();
+  console.log(`Model: ${state.model?.provider}/${state.model?.id}`);
+  console.log(`Thinking: ${state.thinkingLevel ?? "off"}\n`);
+
+  // Handle user input
+  const rl = readline.createInterface({
+    input: process.stdin,
+    output: process.stdout,
+    terminal: true,
+  });
+
+  let isWaiting = false;
+
+  const prompt = () => {
+    if (!isWaiting) process.stdout.write("You: ");
+  };
+
+  rl.on("line", async (line) => {
+    if (isWaiting) return;
+    if (line.trim() === "exit") {
+      await client.stop();
+      process.exit(0);
+    }
+
+    isWaiting = true;
+    await client.promptAndWait(line);
+    console.log("\n");
+    isWaiting = false;
+    prompt();
+  });
+
+  rl.on("SIGINT", () => {
+    if (isWaiting) {
+      console.log("\n[Aborting...]");
+      client.abort();
+    } else {
+      client.stop();
+      process.exit(0);
+    }
+  });
+
+  console.log("Interactive RPC example. Type 'exit' to quit.\n");
+  prompt();
+}
+
+main().catch(console.error);