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/pi-teams/src/utils/paths.ts

@@ -0,0 +1,43 @@
+import fs from "node:fs";
+import os from "node:os";
+import path from "node:path";
+
+export const PI_DIR = path.join(os.homedir(), ".pi");
+export const TEAMS_DIR = path.join(PI_DIR, "teams");
+export const TASKS_DIR = path.join(PI_DIR, "tasks");
+
+export function ensureDirs() {
+  if (!fs.existsSync(PI_DIR)) fs.mkdirSync(PI_DIR);
+  if (!fs.existsSync(TEAMS_DIR)) fs.mkdirSync(TEAMS_DIR);
+  if (!fs.existsSync(TASKS_DIR)) fs.mkdirSync(TASKS_DIR);
+}
+
+export function sanitizeName(name: string): string {
+  // Allow only alphanumeric characters, hyphens, and underscores.
+  if (/[^a-zA-Z0-9_-]/.test(name)) {
+    throw new Error(
+      `Invalid name: "${name}". Only alphanumeric characters, hyphens, and underscores are allowed.`,
+    );
+  }
+  return name;
+}
+
+export function teamDir(teamName: string) {
+  return path.join(TEAMS_DIR, sanitizeName(teamName));
+}
+
+export function taskDir(teamName: string) {
+  return path.join(TASKS_DIR, sanitizeName(teamName));
+}
+
+export function inboxPath(teamName: string, agentName: string) {
+  return path.join(
+    teamDir(teamName),
+    "inboxes",
+    `${sanitizeName(agentName)}.json`,
+  );
+}
+
+export function configPath(teamName: string) {
+  return path.join(teamDir(teamName), "config.json");
+}