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/core/slash-commands.ts

@@ -0,0 +1,44 @@
+export type SlashCommandSource = "extension" | "prompt" | "skill";
+
+export type SlashCommandLocation = "user" | "project" | "path";
+
+export interface SlashCommandInfo {
+  name: string;
+  description?: string;
+  source: SlashCommandSource;
+  location?: SlashCommandLocation;
+  path?: string;
+}
+
+export interface BuiltinSlashCommand {
+  name: string;
+  description: string;
+}
+
+export const BUILTIN_SLASH_COMMANDS: ReadonlyArray<BuiltinSlashCommand> = [
+  { name: "settings", description: "Open settings menu" },
+  { name: "model", description: "Select model (opens selector UI)" },
+  {
+    name: "scoped-models",
+    description: "Enable/disable models for Ctrl+P cycling",
+  },
+  { name: "export", description: "Export session to HTML file" },
+  { name: "share", description: "Share session as a secret GitHub gist" },
+  { name: "copy", description: "Copy last agent message to clipboard" },
+  { name: "name", description: "Set session display name" },
+  { name: "session", description: "Show session info and stats" },
+  { name: "changelog", description: "Show changelog entries" },
+  { name: "hotkeys", description: "Show all keyboard shortcuts" },
+  { name: "fork", description: "Create a new fork from a previous message" },
+  { name: "tree", description: "Navigate session tree (switch branches)" },
+  { name: "login", description: "Login with OAuth provider" },
+  { name: "logout", description: "Logout from OAuth provider" },
+  { name: "new", description: "Start a new session" },
+  { name: "compact", description: "Manually compact the session context" },
+  { name: "resume", description: "Resume a different session" },
+  {
+    name: "reload",
+    description: "Reload extensions, skills, prompts, and themes",
+  },
+  { name: "quit", description: "Quit pi" },
+];