prepare-regression

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Input: PR URL or repository plus commit/range, and registry assignment. Follow project guidance after resolving the target commit.

输入：PR URL 或 repository，加上 commit/range 和 registry assignment。解析目标 commit 后，遵循项目指南。

The same inputs have a verified preparation record; reuse it.

相同输入已有经验证的准备记录时，直接复用。

Read the standard and file contract. Pin the complete change as S0/S1: commit parent or explicit range baseline; merge base to frozen head for unmerged PRs; merge first parent to merge commit, squash parent to squash, or the complete rebased series for merged PRs. Ambiguous ranges and missing root baselines block preparation.
Freeze commit titles/messages or PR title, body, discussion, reviews and inline comments with URLs and collection time. Paginate APIs; record limits and lifecycle. Locate security/threat-model documents in both states; record paths or search limitations.
Run snapshot.py via
```
uv run --no-project
```
with repository, S0, S1 and a new directory, or equivalent Git commands for special source needs. Preserve dependency/submodule/LFS revisions. Exclude later history; keep exports pristine and build in separate copies.
Write and seal
```
prepare.json
```
with boundary explanations, frozen context and source artifacts. If blocked, preserve collected evidence and name the prerequisite.

阅读标准和文件契约。将完整变更固定为 S0/S1：对于 commit，使用其 parent 或显式 range 基线；对于未合并的 PR，使用 merge base 到 frozen head；对于已合并的 PR，使用 merge first parent 到 merge commit、squash parent 到 squash，或完整的 rebased series。存在歧义的 range 或缺少 root baseline 时，将阻塞准备流程。
冻结 commit 标题/消息，或 PR 标题、正文、讨论、reviews 和 inline comments，并记录 URL 和收集时间。对 API 进行分页；记录限制和 lifecycle。在两个状态中定位 security/threat-model 文档；记录路径或搜索限制。
使用
```
uv run --no-project
```
运行 snapshot.py，传入 repository、S0、S1 和一个新目录；对于特殊的源代码需求，也可使用等效的 Git 命令。保留 dependency/submodule/LFS revisions。排除后续 history；保持 exports 原样，并在独立副本中进行构建。
写入并封存
```
prepare.json
```
，其中包含边界说明、冻结的上下文和源文件产物。如果流程被阻塞，保留已收集的证据，并明确说明缺失的前置条件。

Keep detailed evidence in the sealed package. Return only:

将详细证据保存在已封存的 package 中。仅返回：