feat(identity): redirect legacy Zhuyuan ids to ICE-P

skills/codex/enter-fifth-domain/references/route-contract.md

@@ -16,13 +16,14 @@ Resolve these from the live `.code-map` before following them:
 ```text
 FD-WORLD-TREE-001
 FD-PERSONA-LOGIN-001
+FD-SUBJECT-ID-ALIAS-MAP-001
 SYS-GLW-POS-0001
 TCS-LPM
 TCS-LPS-REGISTRY-0001
 LIGHT-LAKE
 LL-CURRENT
 LL-004
-ICE-GL-ZY001
+ICE-P-ZY001
 ZY-PERSONA-ROOT-001
 ZY-OPS-LOOP-001
 FD-NODE-MAP-001
@@ -35,10 +36,11 @@ The shortest current Zhuyuan operations route is:
 
 ```text
 FD-WORLD-TREE-001
+→ FD-SUBJECT-ID-ALIAS-MAP-001
 → SYS-GLW-POS-0001
 → TCS-LPM
 → LL-CURRENT
-→ ICE-GL-ZY001
+→ ICE-P-ZY001
 → ZY-PERSONA-ROOT-001
 → ZY-OPS-LOOP-001
 → FD-NODE-MAP-001
@@ -47,4 +49,14 @@ FD-WORLD-TREE-001
 → REPO-012
 ```
 
+Exact compatibility redirects:
+
+```text
+ICE-GL-ZY001 → ICE-P-ZY001
+ICE-PZY-001  → ICE-P-ZY001
+```
+
+The requested legacy id remains in the resolution receipt, but the route,
+subject type and authority checks use only the canonical id.
+
 This route locates facts. It does not grant write or server authority.