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)

docs/manual-update.md

@@ -1,11 +1,11 @@
 # Manual Update (Non-npm Install)
 
-Use this procedure when `npx get-shit-done-cc@latest` is unavailable — e.g. during a publish outage or if you are working directly from the source repo.
+Use this procedure when `npx get-shit-done-redux@latest` is unavailable — e.g. during a publish outage or if you are working directly from the source repo.
 
 ## Prerequisites
 
 - Node.js installed
-- This repo cloned locally (`git clone https://github.com/gsd-build/get-shit-done`)
+- This repo cloned locally (`git clone https://github.com/GSD-redux/get-shit-done-redux`)
 
 ## Steps