fix: remove playwright auto-install to prevent CI timeout

The execFileSync call to 'npx playwright install chromium' would hang
in CI environments without cached browsers, causing integration tests
to time out. Removing the auto-install step lets chromium.launch()
fail immediately with a clear error, which the tests already handle.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: Addono

README.md

@@ -29,6 +29,24 @@ npm install -g @addono/gh-attach --registry=https://npm.pkg.github.com
 gh extension install Addono/gh-attach
 ```
 
+## Run without installing (npx)
+
+Add the GitHub Packages registry to your project's `.npmrc`:
+
+```
+@addono:registry=https://npm.pkg.github.com
+```
+
+Then run any command directly:
+
+```bash
+# Upload an image
+npx @addono/gh-attach upload ./screenshot.png --target owner/repo#42
+
+# Start the MCP server
+npx @addono/gh-attach mcp --transport stdio
+```
+
 ## Quick Start
 
 ```bash

src/cli/commands/login.ts

@@ -1,5 +1,4 @@
 import { chromium } from "playwright";
-import { execFileSync } from "child_process";
 import {
   isSessionExpired,
   loadSession,
@@ -57,22 +56,6 @@ export async function loginCommand(options: LoginOptions) {
   info("Opening browser for GitHub authentication...");
   info("Please log in to GitHub in the browser window that opens.");
 
-  // Ensure Playwright browsers are installed before attempting to launch
-  const browserPath = chromium.executablePath();
-  if (!browserPath || !(await fileExists(browserPath))) {
-    info("Playwright browsers not found. Installing Chromium...");
-    try {
-      execFileSync("npx", ["playwright", "install", "chromium"], {
-        stdio: "inherit",
-      });
-    } catch {
-      throw new AuthenticationError(
-        "Failed to install Playwright browsers. Run 'npx playwright install chromium' manually.",
-        "PLAYWRIGHT_INSTALL_FAILED",
-      );
-    }
-  }
-
   const browser = await chromium.launch({ headless: false });
   const context = await browser.newContext();
   const page = await context.newPage();
@@ -137,12 +120,3 @@ export async function loginCommand(options: LoginOptions) {
   }
 }
 
-async function fileExists(path: string): Promise<boolean> {
-  try {
-    const { access } = await import("fs/promises");
-    await access(path);
-    return true;
-  } catch {
-    return false;
-  }
-}