chore: point MSD at git.golem15.com/golem15/msd-core

The fork lives on the golem15 Gitea forge, not GitHub. Package identity now
parses either host and derives in-place raw URLs for Gitea; the identity-drift
lint accepts the new host; README drops GitHub-only badges and the npm
quickstart in favour of the checkout installer.

scripts/lint-package-identity-drift.cjs

@@ -31,7 +31,7 @@ const path = require('node:path');
 const PACKAGE_RE = /@[A-Za-z0-9._-]+\/[A-Za-z0-9._-]*get-shit-done[A-Za-z0-9._-]*/g; // msd-allow-legacy-name
 // A MSD repo slug, only inside a GitHub URL context so it never overlaps the
 // scoped package literal above. The `.git` suffix is trimmed before compare.
-const SLUG_RE = /(?:github\.com[/:]|raw\.githubusercontent\.com\/)([A-Za-z0-9._-]+\/[A-Za-z0-9._-]*get-shit-done[A-Za-z0-9._-]*)/g; // msd-allow-legacy-name
+const SLUG_RE = /(?:github\.com[/:]|git\.golem15\.com[/:]|raw\.githubusercontent\.com\/)([A-Za-z0-9._-]+\/[A-Za-z0-9._-]*get-shit-done[A-Za-z0-9._-]*)/g; // msd-allow-legacy-name
 
 function lineOf(text, index) {
   let line = 1;