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)

get-shit-done/workflows/help/modes/default.md

@@ -45,6 +45,6 @@ Topics: `workflow` · `planning` · `execute` · `quick` · `debug` · `capture`
 ## Update GSD
 
 ```bash
-npx get-shit-done-cc@latest
+npx get-shit-done-redux@latest
 ```
 </reference>

get-shit-done/workflows/help/modes/full.md

@@ -18,7 +18,7 @@ Display the complete GSD command reference. Output ONLY the reference content. D
 GSD evolves fast. Update periodically:
 
 ```bash
-npx get-shit-done-cc@latest
+npx get-shit-done-redux@latest
 ```
 
 ## Core Workflow
@@ -560,7 +560,7 @@ Update GSD to latest version with changelog preview.
 - Displays changelog entries for versions you've missed
 - Highlights breaking changes
 - Confirms before running install
-- Better than raw `npx get-shit-done-cc`
+- Better than raw `npx get-shit-done-redux`
 
 Usage: `/gsd:update`