docs: repoint architecture docs at the workspace docs tree; ignore .scratch/

The workspace-root scratch cleanup (2026-09-27) deleted .repro/, the _review_*/
probe bundles and _probe_dataarea/. These tracked documents cited files inside
those directories, so their references are now explicitly marked as historical
and, where the evidence survived, repointed:

- record-channel.md section 7: the ten reproduction conditions are recorded in the
  archived review (docs/archive/reviews/phase12-review.md); reproduce.py is gone.
- studio-3d-stages.md: the _review_scene3d_20260914 review is archived under
  docs/archive/reviews/; the probe_stage6_* scripts and the .repro/ scan scripts
  are marked deleted. The perf report's stale .repro package path is explained in
  a note instead of editing the committed probe report, which feeds
  compile_scene.py --lock-from-probe.
- studio-architecture.md: the scan scripts that generated the diagrams are gone;
  the committed .svg/.png remain the surviving artefacts.

Also ignore .scratch/, the new per-task scratch directory (see
D:\orisys_ws\AGENTS.md). No source file is touched by this commit.

apps/studio/docs/record-channel.md

@@ -218,8 +218,10 @@ outputs/recordings/<UTC 时间戳>_session<NNNN>/
 
 ## 7. 第一、二阶段评审 P1/P2 的整改（数据语义、终态、标定身份、深度重算）
 
-评审脚本 `D:/orisys_ws/_review_phase12/reproduce.py` 的十条复现条件已全部翻转，改后
-输出见同目录 `reproduce_after.log`。以下按发现逐条说明改法。
+评审提出的十条复现条件已全部翻转。**原评审脚本
+`D:/orisys_ws/_review_phase12/reproduce.py` 与其 `reproduce_after.log` 属于一次性工作区临时物，
+已在 2026-09-27 的工作区整理中删除**；十条条件与整改要求逐条记录在归档的评审正文
+`D:\orisys_ws\docs\archive\reviews\phase12-review.md`（"发现与整改条件"一节）。以下按发现逐条说明改法。
 
 ### 7.1 记录语义（P1-1）