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)

bin/gsd-sdk.js

@@ -2,13 +2,13 @@
 /**
  * bin/gsd-sdk.js — back-compat shim for external callers of `gsd-sdk`.
  *
- * When the parent package is installed globally (`npm install -g get-shit-done-cc`)
+ * When the parent package is installed globally (`npm install -g get-shit-done-redux`)
  * npm creates a `gsd-sdk` symlink in the global bin directory pointing at this
  * file. npm correctly chmods bin entries from a tarball, so the execute-bit
  * problem that afflicted the sub-install approach (issue #2453) cannot occur here.
  *
- * NOTE (#2775): `npx get-shit-done-cc` does NOT link this shim — npx only
- * exposes the package's primary bin (`get-shit-done-cc`). For npx-based usage,
+ * NOTE (#2775): `npx get-shit-done-redux` does NOT link this shim — npx only
+ * exposes the package's primary bin (`get-shit-done-redux`). For npx-based usage,
  * the installer (`bin/install.js#installSdkIfNeeded`) self-symlinks `gsd-sdk`
  * into `~/.local/bin` when needed and verifies PATH callability before
  * reporting `✓ GSD SDK ready`.
@@ -19,7 +19,7 @@
  *
  * Call sites (slash commands, agent prompts, hook scripts) continue to work without
  * changes because `gsd-sdk` still resolves on PATH — it just comes from this shim
- * in the parent package rather than from a separately installed @gsd-build/sdk.
+ * in the parent package rather than from a separately installed @gsd-redux/sdk.
  */
 
 'use strict';