docs: comprehensive Jackbox ecast API reverse engineering
Adds complete documentation of the ecast platform covering:
- REST API (8 endpoints including newly discovered /connections, /info, /status)
- WebSocket protocol (connection, message format, 40+ opcodes)
- Entity model (room, player, audience, textDescriptions)
- Game lifecycle (lobby → start → gameplay → end)
- Player/room management answers (counting, join/leave detection, etc.)
Also adds scripts/ws-probe.js utility for direct WebSocket probing.
Made-with: Cursor
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