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docs/design/actor_use_cases.md

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+# Actor Use Cases for Prosperon
+
+Confirmed implementation targets. These are the concrete reasons actors add value beyond basic frame scheduling.
+
+## 1. P2P Networking (Lockstep + Input Streaming)
+
+Actor security model enables safe P2P:
+- **Lockstep**: Both peers run the same actor with the same inputs. Actors are deterministic (same messages in = same state). Synchronize input streams.
+- **Input streaming** (GGPO-style): Each peer sends inputs to the other. Actors only see inputs, not internal state, so cheaters can't fabricate state — only send inputs that the other peer validates by running the simulation.
+- Security-first actor system makes this safe by design.
+
+## 2. Game Sharing (DS Download Play Style)
+
+Send entire cell packages over the network. Receiver runs the game in a sandboxed actor.
+- A cell program/game sends its entire package (code + assets) using the cell package system.
+- The other person runs it in a sandboxed actor — can't touch host filesystem, can't read save data, can only draw sprites and send messages through the allowed interface.
+- Same trust model as mod sandboxing but for complete games.
+
+## 3. Mod Sandboxing
+
+Untrusted code runs in its own actor, communicates through a controlled message interface.
+- Mods can't corrupt game state.
+- Related to game sharing — same isolation model.
+
+## 4. Background Asset Loading
+
+Refactor the resource manager (currently single-threaded) into an actor:
+- Game sends: `{type: 'load', kind: 'image', path: 'player'}`
+- Resources replies: `{type: 'loaded', path: 'player', data: <blob>}`
+- Game never blocks. Request assets, keep running, handle them when they arrive.
+- Sprites show placeholder until real texture lands.
+- This is the natural actor pattern: send a message, get a message back.
+
+## 5. Editor <-> Game Isolation
+
+Editor runs as a separate actor, sends commands to the game actor.
+- Can't corrupt game state.
+- Clean separation of concerns.
+- Editor can inspect/modify game state only through the message interface.