chore: rebrand to GSD-redux/get-shit-done-redux

Mirror of code, issues, and PRs from the upstream gsd-build/get-shit-done,
which appears compromised or abandoned (maintainer unreachable since
2026-04-01; $GSD token linked to rug-pull).

- Adds rebrand notice block at top of English README
- Removes $GSD token badge and @gsd_foundation X badge (keeps Discord)
- Renames npm packages: get-shit-done-cc -> get-shit-done-redux,
  @gsd-build/sdk -> @gsd-redux/sdk
- Updates all repo URLs across docs, workflows, package.json, bin/
- Updates ci@gsd-build -> ci@gsd-redux in workflow git identities
- Leaves CHANGELOG and .changeset/* alone (historical, time-stamped)

tests/docs-parity-live-registry.test.cjs

@@ -105,9 +105,9 @@ const INTERNAL_COMPONENT_SLUGS = new Set([
   // a real command token.
   'init-',
 
-  // gsd-build — GitHub organization name: "github.com/gsd-build/get-shit-done".
+  // gsd-build — GitHub organization name: "github.com/GSD-redux/get-shit-done-redux".
   // Every occurrence of "/gsd-build" in docs is the path component of a GitHub URL
-  // (e.g., "[#2792](https://github.com/gsd-build/get-shit-done/issues/2792)").
+  // (e.g., "[#2792](https://github.com/GSD-redux/get-shit-done-redux/issues/2792)").
   // The regex captures "/gsd-build" from the URL path. Not a slash command.
   'build',