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P5 backend (the deferred items): - conflict-aware cloud sync via optimistic concurrency: the server versions each backup blob (file mtime) and rejects a push whose base version is stale (409), so a second device can't silently overwrite a newer cloud copy. The client tracks its last-synced version; the SyncStatusIndicator surfaces a "Sync conflict" with one-click resolution (Use cloud / Keep this device), and the Settings push offers the same choice. - revocable invites: owner can rotate a campaign's invite code (kills the old one) and remove a member (drops them + deletes their published characters). (Skipped editor/player roles — no enforcement target in the current model.) - image storage: deliberately deferred (live images already stream de-duped on a separate channel; a backup blob-store is infra with no correctness gain). P7 — subclass/feat/multiclass depth: - feats are now first-class tracked records (name + effect text) in a Feats & Features sheet section, not buried in notes. Dexie v15 migration. - 5e multiclass spell-slot calculator: a pure multiclassSlots() (full ×1, half ÷2, third ÷3 → full-caster table) + a sheet control to fill the slot table for multiclass casters. (Honest scope: tracking + slots, not per-subclass feature automation.) P8 — test hardening: v2-surfaces e2e (feats, multiclass calc, signals bell, World nav) + server tests (blob versioning, invite rotation, member removal) + multiclass unit tests. Gate green: 283 unit + 35 e2e + 2 realtime. App + server build clean. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>