Add Codex repo-specific tracking structure

Codex/Portal/OPEN_ITEMS.md

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+# Portal — Open Items
+
+Only keep unfinished Portal work here.
+
+## Active
+- confirm hosted "Open IDE" button fully uses hosted URL flow
+- SSH config snippet for power users
+- email notifications
+- remove stray root binary `testdameon` / `testdaemon`
+- portal polish around backup/restore and any new checkpoint metadata once wired through API
+
+## Verify before re-opening
+- backup list/create/restore/delete UI
+- readiness/operation state UI
+- start/stop/restart gating on stopped vs starting vs ready servers
+- billing page alignment with current billing state
+- forgot/reset password pages and linkage
+- onboarding modal flow
+
+## Not Portal-owned
+- agent-local backup implementation details
+- API transport semantics
+- PBS / infra backup strategy