Update root open threads to reflect validated platform behavior

OPEN_THREADS.md

@@ -13,10 +13,11 @@ Keep this file short.
 
 ## Cross-Repo Active
 
-### Game backup integration
+### Backup / restore UX and contract polish
-- normalize backup response shape across API and Portal so list/create/restore/delete have stable success bodies and a consistent error envelope
+- keep Portal aligned with async restore start + status polling
-- validate local Minecraft backup/restore flow on a real live server end-to-end
+- keep restore wording/status transitions clear through completion and restart
-- confirm checkpoint metadata presentation once API exposes the final stable fields to Portal
+- confirm checkpoint metadata presentation remains clean when exposed to Portal
+- consider later hardening for automatic rollback from pre-restore checkpoint if restore apply/start fails after destructive replace
 
 ### Dev access / IDE / SSH
 - simplify and harden API `devProxy`
@@ -55,6 +56,20 @@ Keep this file short.
 
 ---
 
+## Recently Verified / No Longer Considered Blocked
+
+- local Minecraft backup create/restore works end-to-end on live validation
+- restore creates intentional pre-restore checkpoint and API now starts restore asynchronously instead of holding the full request open
+- backup timestamps are normalized and pre-restore checkpoints are filtered from the default backup list
+- agent-backed file edits create shadow copies for revert and API route/stream forwarding issues were fixed
+- vanilla / fabric runtime split is restored:
+  - `vanilla` = Fabric-based internal profile with proxy/API/config injection
+  - `fabric` = plain Fabric jar delivery only
+- Forge / Neoforge first-start flow now avoids premature readiness gating, applies post-start property enforcement, and restarts through the readiness-aware path
+- current validation indicates Minecraft server creation succeeds across supported runtime variants
+
+---
+
 ## Platform Future
 
 - CF Tunnel SSH completion beyond first working path