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/INVENTORY.md

@@ -60,7 +60,7 @@ Full roster at `commands/gsd/*.md`. The groupings below mirror `docs/COMMANDS.md
 
 ### Namespace Meta-Skills
 
-These six routers are descriptor-only entries that the model picks first; the body of each contains a routing table that points at the correct concrete sub-skill. They exist to keep the eager skill-listing token cost low while the full surface remains reachable. See [#2792](https://github.com/gsd-build/get-shit-done/issues/2792) for the rationale; the routing tables target the post-[#2790](https://github.com/gsd-build/get-shit-done/issues/2790) consolidated surface.
+These six routers are descriptor-only entries that the model picks first; the body of each contains a routing table that points at the correct concrete sub-skill. They exist to keep the eager skill-listing token cost low while the full surface remains reachable. See [#2792](https://github.com/GSD-redux/get-shit-done-redux/issues/2792) for the rationale; the routing tables target the post-[#2790](https://github.com/GSD-redux/get-shit-done-redux/issues/2790) consolidated surface.
 
 | Command | Role | Source |
 |---------|------|--------|