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)

scripts/verify-tarball-sdk-dist.sh

@@ -1,5 +1,5 @@
 #!/usr/bin/env bash
-# Verify the published get-shit-done-cc tarball actually contains
+# Verify the published get-shit-done-redux tarball actually contains
 # sdk/dist/cli.js and that the `query` subcommand is exposed.
 #
 # Guards regression of bug #2647: v1.38.3 shipped without sdk/dist/