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CLAUDE.md

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 # Dusk — Claude Code rules
 
+See `STATUS.md` for a periodically-refreshed inventory of subsystem
+maturity, test coverage gaps, and known open issues — check it before
+assuming a subsystem is fully wired up or before picking a next task.
+
 ## File headers
 Every C, H, and JS file starts with:
 
@@ -251,6 +255,31 @@ Entity prefabs (`src/dusk/entity/entityprefab.h`) and scene prefabs
 
 ---
 
+## Save system
+Save data lives under `src/dusk/save/` (`save.h`/`savefile.h`/
+`saveplatform.h`). Slots are fixed-count (`SAVE_FILE_COUNT_MAX`), each
+holding a yyjson document persisted with its byte size and a CRC32
+checksum. `saveLoad`/`saveSave` read/write the JSON fresh every call —
+callers own the returned/passed `yyjson_doc`/`yyjson_mut_doc` and must
+free it themselves. Actual file I/O goes through platform-specific
+`saveplatform_t`/stream hooks (one implementation per platform under
+`src/dusk<platform>/save/`) — do not add direct filesystem calls to the
+core `save.c`, extend the platform stream hooks instead.
+
+## Network system
+`src/dusk/network/` (`network.h`) is a connection-state layer only — a
+`networkstate_t` state machine (`DISCONNECTED`/`CONNECTING`/`CONNECTED`/
+`DISCONNECTING`) plus an HTTP client (`network/http/`) used for one-off
+requests. It is not a multiplayer/replication protocol — that layer
+doesn't exist yet (see `ROADMAP.md` items on the socket server/client
+and packet handlers). Platform-specific connection logic (e.g. PSP's
+`sceNetApctl` polling, GameCube/Wii's `if_config()`) lives under
+`src/dusk<platform>/network/`, wired through `networkplatform.h` macros
+the same way display/input are. Whenever this eventually grows a
+multiplayer protocol, apply `ROADMAP.md`'s principle: never trust
+incoming packet data — validate defensively with `errorret_t`/
+`errorThrow()`, not asserts.
+
 ## Adding a new script (JS) module
 Dusk embeds JerryScript (`src/dusk/script/`, fetched via
 `cmake/modules/Findjerryscript.cmake`). Today only `Entity`, the