nx_game_chat.nx

nx_game_chat.nx -- C12 of the comms lane: TURN-BASED MULTIPLAYER + CHAT over the C1 store. Contract symbol gc_room_wire == the /compare/comms C12 watch (milestone M5: comms visible in the games). DONE-RULE (comms.plan): a game opens a room per session and two clients exchange moves and chat through the C1 store; the gate proves order and delivery with the game's own rules as the referee. REFEREE: nx_game_chat_gate. THE DESIGN: THE LOG IS THE GAME. A match is an ordinary nx_chat_store room; moves are TEXT rows with the reserved body prefix mv:<n>; the CURRENT STATE is a DETERMINISTIC REPLAY of the log. The move verb validates against the replayed state before appending, and the replay validates AGAIN on every read -- so a row that slipped in out of turn (a race, or a client that lied) is counted and IGNORED by every reader identically: replay is the referee, the wire is untrusted. Store-and-forward multiplayer follows free: an offline player fetches-since-cursor and the same replay produces the same board on every device (C2 sync moves whole matches between roots). GAME DEFINITIONS ARE DATA (knowledge/comms/games.conf): id, cols, rows, winlen, mode (drop = gravity, connect-four class; place = direct cell, tic-tac-toe class). A new grid game is a conf row. WRITES go through the ONE ruler -- this organ forks the nx_chat_store elf named in the conf, so budgets/refusals/announcements stay with C1; READS are direct plane reads (the same split C2 established). Chat rides the same room (say verb); a chat body may not start with the reserved mv: prefix (refused by name). Tombstones hide CHAT from display but NEVER hide moves: a game's history is its state, so replay ignores del: keys for move rows by design (stated, not accidental). The emitted HTML artifact stamps itself from the LAST ROW's epoch, never the wall clock, so two emits of the same log are byte-identical (deterministic artifacts). license_tier: ORIGINAL No hw writes (Rule 26).