### Added
- `gsd-redux` adapter — `get-shit-done-redux` (`@opengsd/get-shit-done-redux`) added as a
  sixth framework candidate in the `plan_spec` slot. Full in-session lifecycle enforcement
  (plan → execute → verify → ship) with wave parallelism; community fork of `get-shit-done-cc`
  under the `open-gsd` org (April 2026 governance split from `gsd-build`).
- `gsd-redux-superpowers` composition block — YELLOW demotion block for
  get-shit-done-redux + Superpowers (same surgical-disabling pattern as BMAD + Superpowers).
  Only the pure discipline subset (TDD, code-review, debugging, refactoring) remains active;
  gsd-redux owns both planning and execution phases.
- `stacks.yaml` — 6 new entries: `gsd-redux` (solo GREEN), `gsd-redux-superpowers` (YELLOW),
  and 4 RED combinations (vs. all other plan_spec layers and gsd2).
- `AGENTS.md` — updated "What you are choosing between" section (five → six frameworks,
  Plan/Spec slot now lists get-shit-done-redux); new rubric row for get-shit-done-redux; two
  new compatibility matrix entries (YELLOW with Superpowers, RED with gsd-pi); new
  discriminating fork (get-shit-done-redux vs. OpenSpec); REFUSE state updated to include
  get-shit-done-redux same-slot and gsd-pi incompatibility.
- `README.md` — "The five frameworks" expanded to six; get-shit-done-redux row added to the
  framework table; compatibility matrix updated with gsd-redux rows; credits updated.

### Fixed
- `gsd2` adapter — migrated all references from the abandoned `gsd-build` org to the
  community fork `open-gsd/gsd-pi` (package: `@opengsd/gsd-pi@latest`, repo URL updated).
  The `gsd-build` maintainer became unreachable in April 2026; `open-gsd` is the canonical
  continuation. No functional changes to detection, artifact layout, or install mode.
- `README.md` — upstream credit link for GSD-2 updated from `gsd-build/GSD-2` to
  `open-gsd/gsd-pi` (closes #13).

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