chore: migrate references from gsd-build to open-gsd/get-shit-done-redux (#120) (#121)

Security-motivated migration of all stale repository and npm-scope references.

Three categories of changes (58 files, 174 substitutions):

1. gsd-build → open-gsd (security-critical):
   - .github/workflows/release-sdk.yml — npm token comment, tarball filename pattern
   - .github/workflows/hotfix.yml — same
   - .changeset/fix-3406-detect-stale-sdk-shadow.md — @gsd-build/sdk → @open-gsd/sdk
   - .changeset/sharp-quails-leap.md — same
   - get-shit-done/workflows/update.md — CHANGELOG raw GitHub URL

2. GSD-redux org slug → open-gsd (canonical rename):
   - package.json + sdk/package.json — repository/homepage/bugs metadata
   - All README.*.md — live badge and link sections
   - CONTRIBUTING.md, CONTEXT.md, QUICK-WINS-CONFIRMED-BUGS.md
   - .coderabbit.yaml, .release-monitor.sh, scripts/sync-rulesets.sh
   - docs/** — all live agent/ADR/user-facing documentation
   - tests/** — repo slug assertions and test fixtures
   - scripts/changeset/cli.cjs + github-release-notes.cjs
   - .github/ISSUE_TEMPLATE/*, .github/pull_request_template.md
   - bin/install.js, get-shit-done/bin/lib/model-catalog.cjs
   - sdk/HANDOVER-*.md, sdk/src/*.test.ts

3. CLAUDE.md (gitignored local file — not in this commit):
   Updated separately outside git: --repo gsd-build/get-shit-done →
   --repo open-gsd/get-shit-done-redux with security warning.

Intentionally unchanged: CHANGELOG.md, docs/RELEASE-*.md,
.changeset/README.md, .changeset/build-hooks-atomic-write.md,
README.md migration table (historical fork record),
tests/changeset-serialize.test.cjs line 78 (serialization fixture).

The gsd-build/get-shit-done repo is compromised (rug-pull documented in
README.md). Do not push to or interact with that repo.

Closes #120

README.ja-JP.md

@@ -12,9 +12,9 @@
 
 [![npm version](https://img.shields.io/npm/v/get-shit-done-redux?style=for-the-badge&logo=npm&logoColor=white&color=CB3837)](https://www.npmjs.com/package/get-shit-done-redux)
 [![npm downloads](https://img.shields.io/npm/dm/get-shit-done-redux?style=for-the-badge&logo=npm&logoColor=white&color=CB3837)](https://www.npmjs.com/package/get-shit-done-redux)
-[![Tests](https://img.shields.io/github/actions/workflow/status/GSD-redux/get-shit-done-redux/test.yml?branch=main&style=for-the-badge&logo=github&label=Tests)](https://github.com/GSD-redux/get-shit-done-redux/actions/workflows/test.yml)
+[![Tests](https://img.shields.io/github/actions/workflow/status/open-gsd/get-shit-done-redux/test.yml?branch=main&style=for-the-badge&logo=github&label=Tests)](https://github.com/open-gsd/get-shit-done-redux/actions/workflows/test.yml)
 [![Discord](https://img.shields.io/badge/Discord-Join-5865F2?style=for-the-badge&logo=discord&logoColor=white)](https://discord.gg/mYgfVNfA2r)
-[![GitHub stars](https://img.shields.io/github/stars/GSD-redux/get-shit-done-redux?style=for-the-badge&logo=github&color=181717)](https://github.com/GSD-redux/get-shit-done-redux)
+[![GitHub stars](https://img.shields.io/github/stars/open-gsd/get-shit-done-redux?style=for-the-badge&logo=github&color=181717)](https://github.com/open-gsd/get-shit-done-redux)
 [![License](https://img.shields.io/badge/license-MIT-blue?style=for-the-badge)](LICENSE)
 
 <br>
@@ -77,7 +77,7 @@ GSDはそれを解決します。Claude Codeを信頼性の高いものにする
 
 ### v1.39.0 ハイライト
 
-完全なリストは [v1.39.0 リリースノート](https://github.com/GSD-redux/get-shit-done-redux/releases/tag/v1.39.0) を参照してください。
+完全なリストは [v1.39.0 リリースノート](https://github.com/open-gsd/get-shit-done-redux/releases/tag/v1.39.0) を参照してください。
 
 - **`--minimal` インストールプロファイル** — エイリアス `--core-only`。メインループの6スキル（`new-project`、`discuss-phase`、`plan-phase`、`execute-phase`、`help`、`update`）のみをインストールし、`gsd-*` サブエージェントはゼロ。コールドスタート時のシステムプロンプトのオーバーヘッドを ~12kトークンから ~700トークンへ削減（≥94%減）。32K〜128Kコンテキストのローカル LLM やトークン課金 API に有効。
 - **`/gsd-phase --edit`** — `ROADMAP.md` 上の既存フェーズの任意フィールドをその場で編集（番号や位置は変更されない）。`--force` で確認 diff をスキップ、`depends_on` の参照を検証し、書き込み時に `STATE.md` も更新。
@@ -180,7 +180,7 @@ npx get-shit-done-redux --all --global      # すべてのディレクトリに
 リポジトリをクローンしてインストーラーをローカルで実行します：
 
 ```bash
-git clone https://github.com/GSD-redux/get-shit-done-redux.git
+git clone https://github.com/open-gsd/get-shit-done-redux.git
 cd get-shit-done
 node bin/install.js --claude --local
 ```
@@ -847,11 +847,11 @@ OpenCode、Gemini CLI、Kilo、Codexは `npx get-shit-done-redux` でネイテ
 
 ## スター履歴
 
-<a href="https://star-history.com/#GSD-redux/get-shit-done-redux&Date">
+<a href="https://star-history.com/#open-gsd/get-shit-done-redux&Date">
  <picture>
-   <source media="(prefers-color-scheme: dark)" srcset="https://api.star-history.com/svg?repos=GSD-redux/get-shit-done-redux&type=Date&theme=dark" />
-   <source media="(prefers-color-scheme: light)" srcset="https://api.star-history.com/svg?repos=GSD-redux/get-shit-done-redux&type=Date" />
-   <img alt="Star History Chart" src="https://api.star-history.com/svg?repos=GSD-redux/get-shit-done-redux&type=Date" />
+   <source media="(prefers-color-scheme: dark)" srcset="https://api.star-history.com/svg?repos=open-gsd/get-shit-done-redux&type=Date&theme=dark" />
+   <source media="(prefers-color-scheme: light)" srcset="https://api.star-history.com/svg?repos=open-gsd/get-shit-done-redux&type=Date" />
+   <img alt="Star History Chart" src="https://api.star-history.com/svg?repos=open-gsd/get-shit-done-redux&type=Date" />
  </picture>
 </a>