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Design: MCP server for playing games via direct Postgres access (#1738)

* docs: design for an MCP server that plays games via direct Postgres access

Proposes a new mcp/ workspace deployed as its own Vercel project: a
streamable-HTTP MCP server (mcp-handler) that replays instance.commands
through hathora-et-labora-game to read state and generate legal moves,
and appends the agent's moves via a new atomic append_command RPC with
seat/turn/legality checks.

https://claude.ai/code/session_014h6xGU1ANSDE7fnrk3rcF5

* docs: host the MCP server as a route in the existing web app

Adapts the design from a separate mcp/ Vercel project to
web/src/app/api/[transport]/route.ts inside the existing kennerspiel
project: same mcp-handler/tool surface, service-role client added as a
sibling supabase util, middleware matcher excludes the MCP route, and
the engine version-skew risk disappears since the tools share web/'s
hathora-et-labora-game dependency. Doc moves to docs/.

https://claude.ai/code/session_014h6xGU1ANSDE7fnrk3rcF5

* docs: correct MCP endpoint domain to kennerspiel.com

https://claude.ai/code/session_014h6xGU1ANSDE7fnrk3rcF5

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Co-authored-by: Claude <noreply@anthropic.com>

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