Move Codex project notes to .codex

.codex/README.md

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+# Codex Project Notes
+
+This directory stores project-specific Codex working conventions.
+
+Use these files as the startup layer for future sessions in `pbf`.
+
+## Files
+
+- [`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)
+  - a ready-to-use prompt for continuing the project
+
+## Core Rule
+
+If there has been meaningful progress, update:
+
+- [`STEP_RECORD.md`](/root/sourceserver/pbf/STEP_RECORD.md)
+
+That file is the current source of truth for "where we stopped last time."

.codex/RESUME_PROMPT.md

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+# Resume Prompt
+
+Use this prompt to continue the project quickly:
+
+`继续处理 /root/sourceserver/pbf/STEP_RECORD.md 里记录的下一步，先读 STEP_RECORD.md 和 AGENTS.md，再从 Karatsu 10nm delivery 审计的 baseline / depth / navigation marks 三组问题开始修。`

.codex/SESSION_START.md

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+# Session Start
+
+When opening this project again, do this first:
+
+1. Read [`STEP_RECORD.md`](/root/sourceserver/pbf/STEP_RECORD.md).
+2. Read [`AGENTS.md`](/root/sourceserver/pbf/AGENTS.md).
+3. Run:
+
+```bash
+cd /root/sourceserver/pbf
+git status --short --branch
+git remote -v
+sed -n '1,220p' STEP_RECORD.md
+```
+
+## Current Resume Target
+
+Unless a newer step record says otherwise, continue from:
+
+- `Karatsu 10nm delivery` audit follow-up
+- priority groups:
+  - `baseline`
+  - `depth / bathymetry`
+  - `navigation marks`
+
+## Audit Reminder
+
+The current trusted delivery audit line is:
+
+```bash
+.venv/bin/python navsea_render_audit.py \
+  --audit-name navsea_original_vs_delivery_karatsu_10nm_20260331 \
+  --comparison-label 'delivery版' \
+  --fid-key 'thisMyWorld@2026' \
+  --match-on-fid-only \
+  --original-style /root/sourceserver/pbf/src/pbf/style.json \
+  --engineering-style /root/sourceserver/pbf/src/pbf/style.navsea-delivery-karatsu-10nm.json \
+  --original-tile-root /home/wwwroot/newpec/exported_auto/tile.mapple-on.jp__newpec-mvt-20260106__z___x___y_.pbf/tiles \
+  --engineering-tile-root /home/wwwroot/pbf-delivery-karatsu-10nm \
+  --report-md /root/sourceserver/pbf/NavSea_Original_vs_Delivery_Render_Audit_Karatsu_10nm_2026-03-31.md \
+  --report-json /root/sourceserver/pbf/NavSea_Original_vs_Delivery_Render_Audit_Karatsu_10nm_2026-03-31.json \
+  --skip-db-persist
+```
+
+## Stop Rule
+
+Before ending a work session, update [`STEP_RECORD.md`](/root/sourceserver/pbf/STEP_RECORD.md).