Harden dev-flow: pre-authorization marker, alternatives log, check script

- Record rejected answers in decision.md at the moment they are rejected

- Allow explicit pre-authorized Build via a pre-authorized marker line

- Land scripts/check-dev-flow.sh and derive devflow/index.md from archives

- Add dev-flow process artifacts (decisions, prd) for open changes

openspec/changes/archive/2026-09-18-migrate-devflow-archives/proposal.md

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+## Why
+
+dev-flow 重设计(2026-09-18)取消了 devflow 作为独立档案层的定位:决策档案唯一落点为 `openspec/changes/<slug>/decision.md`,随归档冻结;devflow/ 收缩为 glossary + rejected + 派生 index。历史遗留 9 个项目、37 个文件需要按新布局处置,否则新旧两种真理源布局长期并存。
+
+SuperBizAgent-java 实测(46 项目/180 文件)已给出处置口径:压缩 Q&A 与 ADR 段落并入对应归档的 decision.md,骨架文件删除。本仓库先以单样本(`2026-05-18-knowledge-index-panel`)验证规则,再定批量执行。
+
+## What Changes
+
+- 为 `openspec/changes/knowledge-index-panel/` 新建 `decision.md`:内容迁移自 `devflow/projects/2026-05-18-knowledge-index-panel/adr/0001-directory-name-as-truth-source.md`(五节俱全),标注迁移来源
+- `knowledge-index-panel-prd.md` 含独有内容(User Stories、测试决策),收存为 `openspec/changes/knowledge-index-panel/prd.md`
+- 更新 `devflow/glossary/CONTEXT.md` 中对 ADR-0001 旧路径的引用,指向新位置
+- 本 change(`migrate-devflow-archives`)自身按 dev-flow 协议执行,其 decision.md 记录迁移规则本身
+- 其余 8 个项目:本次不动(见 Non-Goals)
+
+## Non-Goals
+
+- 不批量迁移其余 8 个项目——单样本验证规则后另行执行
+- 不删除 `devflow/projects/` 下任何现有文件——删除等批量规则稳定后统一处理
+- 不处理 3 个活跃 change 中另外两个(`add-year-filter` 已有 decision.md;`sm-flow-execution-hardening` 待其自身 Close)
+
+## Impact
+
+- `openspec/changes/knowledge-index-panel/` 新增 2 文件(decision.md、prd.md)
+- `devflow/glossary/CONTEXT.md` 改 1 处链接
+- `scripts/check-dev-flow.sh knowledge-index-panel` 应由 ✗ 转 ✓
+- 迁移规则沉淀在 `openspec/changes/migrate-devflow-archives/decision.md`,作为后续批量迁移的依据