Add Codex repo-specific tracking structure

Codex/Agent/OPEN_ITEMS.md

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+# Agent — Open Items
+
+Only keep unfinished Agent work here.
+
+## Active
+- validate local Minecraft backup/restore flow on real live servers
+- retention refinement for local backups/checkpoints
+- runtime install verification improvements
+- catalog hash validation
+- runtime removal / upgrade handling
+- runtime update process for dev containers
+- PATH normalization
+- shell profile consistency
+- runtime PATH injection
+- graceful shutdown verification
+- process reattachment on agent restart
+- SSH server install in dev provisioning
+- structured logging for Loki
+- `provisioningComplete` state surfacing in `/status`
+
+## Clarified boundary
+- do not add agent-side remote/offsite backup sync if PBS/platform layer is the intended durability path
+- agent backup scope is local, app-aware rollback
+
+## Verify before re-opening
+- readiness-aware start/restart unification
+- guarded operation locking
+- crash recovery path consolidation
+- local Minecraft backup CRUD
+- pre-restore checkpoint hardening
+
+## Not Agent-owned
+- API response-shape normalization for frontend consumers
+- portal UX/polish
+- PBS/offsite backup strategy