Move Codex project notes to .codex

.codex/README.md

@@ -6,9 +6,9 @@ Use these files as the startup layer for future sessions in `pbf`.
 
 ## Files
 
-- [`SESSION_START.md`](/root/sourceserver/pbf/codex/SESSION_START.md)
+- [`SESSION_START.md`](/root/sourceserver/pbf/.codex/SESSION_START.md)
   - what to read first when resuming work
-- [`RESUME_PROMPT.md`](/root/sourceserver/pbf/codex/RESUME_PROMPT.md)
+- [`RESUME_PROMPT.md`](/root/sourceserver/pbf/.codex/RESUME_PROMPT.md)
   - a ready-to-use prompt for continuing the project
 
 ## Core Rule

STEP_RECORD.md

@@ -14,9 +14,9 @@ Remote: `ssh://git@nas:2222/tei/pbf.git`
   - [`GIT_REMOTE_SWITCH_TO_NAS_2026-03-31.md`](/root/sourceserver/pbf/GIT_REMOTE_SWITCH_TO_NAS_2026-03-31.md)
 - 已补项目协作约定文件：
   - [`AGENTS.md`](/root/sourceserver/pbf/AGENTS.md)
-  - [`codex/README.md`](/root/sourceserver/pbf/codex/README.md)
-  - [`codex/SESSION_START.md`](/root/sourceserver/pbf/codex/SESSION_START.md)
-  - [`codex/RESUME_PROMPT.md`](/root/sourceserver/pbf/codex/RESUME_PROMPT.md)
+  - [`.codex/README.md`](/root/sourceserver/pbf/.codex/README.md)
+  - [`.codex/SESSION_START.md`](/root/sourceserver/pbf/.codex/SESSION_START.md)
+  - [`.codex/RESUME_PROMPT.md`](/root/sourceserver/pbf/.codex/RESUME_PROMPT.md)
 - 已完成一次新的 delivery 审计，并确认哪条审计线可用
 
 ## Latest Audit Status