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/STATE-MD-LIFECYCLE.md

@@ -1,7 +1,7 @@
 # STATE.md Phase Lifecycle Frontmatter
 
 > **Status:** Read-side shipped in v1.40.0 (issue
-> [#2833](https://github.com/gsd-build/get-shit-done/issues/2833)).
+> [#2833](https://github.com/GSD-redux/get-shit-done-redux/issues/2833)).
 > `parseStateMd()` reads the four frontmatter fields below and
 > `formatGsdState()` renders the in-flight / idle / progress scenes.
 > SDK write-side support to maintain the fields automatically is tracked