fix: replace invalid Discord invite links with canonical URL (#3056)

Closes #2699

The Discord badge in README.md pointed to https://discord.gg/gsd (expired
vanity URL) and the Pi ecosystem doc used an old invite code. Both now use
the canonical invite https://discord.com/invite/nKXTsAcmbT that was
established in commit 0a1dad9a.

Adds a regression test that validates all Discord invite links in
user-facing files match the canonical URL.

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

README.md

@@ -7,7 +7,7 @@
 [![npm version](https://img.shields.io/npm/v/gsd-pi?style=for-the-badge&logo=npm&logoColor=white&color=CB3837)](https://www.npmjs.com/package/gsd-pi)
 [![npm downloads](https://img.shields.io/npm/dm/gsd-pi?style=for-the-badge&logo=npm&logoColor=white&color=CB3837)](https://www.npmjs.com/package/gsd-pi)
 [![GitHub stars](https://img.shields.io/github/stars/gsd-build/GSD-2?style=for-the-badge&logo=github&color=181717)](https://github.com/gsd-build/GSD-2)
-[![Discord](https://img.shields.io/badge/Discord-Join%20us-5865F2?style=for-the-badge&logo=discord&logoColor=white)](https://discord.gg/gsd)
+[![Discord](https://img.shields.io/badge/Discord-Join%20us-5865F2?style=for-the-badge&logo=discord&logoColor=white)](https://discord.com/invite/nKXTsAcmbT)
 [![License](https://img.shields.io/badge/license-MIT-blue?style=for-the-badge)](LICENSE)
 [![$GSD Token](https://img.shields.io/badge/$GSD-Dexscreener-1C1C1C?style=for-the-badge&logo=data:image/svg+xml;base64,PHN2ZyB3aWR0aD0iMjQiIGhlaWdodD0iMjQiIHZpZXdCb3g9IjAgMCAyNCAyNCIgZmlsbD0ibm9uZSIgeG1sbnM9Imh0dHA6Ly93d3cudzMub3JnLzIwMDAvc3ZnIj48Y2lyY2xlIGN4PSIxMiIgY3k9IjEyIiByPSIxMCIgZmlsbD0iIzAwRkYwMCIvPjwvc3ZnPg==&logoColor=00FF00)](https://dexscreener.com/solana/dwudwjvan7bzkw9zwlbyv6kspdlvhwzrqy6ebk8xzxkv)
 

docs/what-is-pi/15-pi-packages-the-ecosystem.md

@@ -38,6 +38,6 @@ Or just use conventional directory names (`extensions/`, `skills/`, `prompts/`,
 
 - [Package gallery](https://shittycodingagent.ai/packages)
 - [npm search](https://www.npmjs.com/search?q=keywords%3Api-package)
-- [Discord community](https://discord.com/invite/3cU7Bz4UPx)
+- [Discord community](https://discord.com/invite/nKXTsAcmbT)
 
 ---

src/resources/extensions/gsd/tests/discord-invite-links.test.ts

@@ -0,0 +1,47 @@
+import assert from "node:assert/strict";
+import { describe, it } from "node:test";
+import { readFileSync } from "node:fs";
+import { join } from "node:path";
+
+/**
+ * Validates that all Discord invite links in user-facing files point to valid,
+ * consistent invite URLs — not expired vanity links.
+ *
+ * Regression test for https://github.com/gsd-build/gsd-2/issues/2699
+ */
+
+const ROOT = process.cwd();
+
+/** Canonical Discord invite for the GSD community. */
+const VALID_INVITE = "https://discord.com/invite/nKXTsAcmbT";
+
+/** Files that contain user-facing Discord invite links. */
+const FILES_WITH_INVITE_LINKS: string[] = [
+  "README.md",
+  "docs/what-is-pi/15-pi-packages-the-ecosystem.md",
+];
+
+describe("Discord invite links (#2699)", () => {
+  for (const relPath of FILES_WITH_INVITE_LINKS) {
+    it(`${relPath} contains only the canonical Discord invite`, () => {
+      const content = readFileSync(join(ROOT, relPath), "utf8");
+
+      // Extract all Discord invite URLs (discord.gg/X or discord.com/invite/X)
+      const invitePattern = /https?:\/\/(?:discord\.gg|discord\.com\/invite)\/[A-Za-z0-9]+/g;
+      const matches = content.match(invitePattern);
+
+      assert.ok(
+        matches && matches.length > 0,
+        `Expected at least one Discord invite link in ${relPath}`,
+      );
+
+      for (const link of matches) {
+        assert.equal(
+          link,
+          VALID_INVITE,
+          `Invalid Discord invite in ${relPath}: found "${link}", expected "${VALID_INVITE}"`,
+        );
+      }
+    });
+  }
+});