CF-6.6: Presence and reconnect #252

Objective

Handle duplicate tabs, dropped sockets, stale commands, rejoin, and DM ownership changes.

Milestone outcome

DM and player clients share an authoritative real-time battle/session state
coordinated by Durable Objects.

Milestone dependency

CF-4, CF-5

Milestone exit gate

• Two or more devices observe ordered, authoritative state changes in staging.
• Duplicate/replayed commands are idempotent and stale commands cannot rewind
  the session.
• A hibernated, evicted, or newly deployed object restores without losing the
  latest acknowledged durable state.
• Player connections cannot retrieve DM-only notes, hidden creatures, or secret
  map data.
• Session close/archive produces a durable campaign record and releases active
  resources according to policy.

Definition of done

The applicable repository-wide definition of done in the Cloudflare cloud-native roadmap must be satisfied before this issue closes.

Source

• Roadmap work package: CF-6.6
• Milestone: CF-6 — Live Session Runtime