Flash Gambit: the Vibe — starter SOURCE prototype

Source commit: eaeea78298536d38e2fc5e2b9f7123378f309aa8

Start here: python3 tools/bot-sdk/sdk.py init ./my-bot
Then edit my-bot/Bot.cs and bot.json.

This download includes the starter and local source/pack tool only. Building requires the selected Contracts DLL, core-abi.json, .NET compiler/references and built Inspect.dll, which are not bundled. Read tools/bot-sdk/README.md. Upload, runtime sandbox validation, payment and match execution are not connected by this download. A static check is not runtime acceptance.
