Fix comparison baseline for JP-field migration

AGENTS.md

@@ -35,6 +35,33 @@ Important limitation:
 
 - `Karatsu 20nm delivery` is currently not object-auditable with the existing audit script because the delivery PBF no longer preserves enough trace-back anchor fields
 
+## Current Visual Regression Baseline
+
+For the current goal of:
+
+- removing Japanese fields from the PBF-facing path
+- while keeping the rendered appearance as close as possible to the legacy chart
+
+use this fixed comparison page as the only primary visual baseline:
+
+- `http://192.168.200.184/newpec/domain/navsea-compare-legacy-domain-compatible.html`
+
+The right side of that page is the current working target line.
+
+Current target PBF line for this goal:
+
+- `pbf-domain-karatsu-10nm`
+- package sources:
+  - `domain_safety`
+  - `domain_detail`
+
+Rules:
+
+- do not create additional comparison pages for this migration unless explicitly requested
+- do not switch the primary comparison URL casually
+- treat the fixed page above as the stable regression surface for visual checking
+- keep delivery-line experiments separate from this baseline unless the user explicitly redirects the work
+
 ## Working Rules
 
 ### 1. Step Record Must Stay Fresh