this derivation will be built:
  /nix/store/l1qf7fjgn4vdd2wdpswwjh47hy9p65r9-treefmt-check.drv
error: Cannot build '/nix/store/l1qf7fjgn4vdd2wdpswwjh47hy9p65r9-treefmt-check.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/wyf2z5ryz3nk44g5lwq7r3fqkdh0yf0a-treefmt-check
       Last 18 log lines:
       > treefmt v2.6.0traversed 575 files
       > emitted 380 files for processing
       > formatted 380 files (1 changed) in 2.209s
       >  M packages/spaces-integration-gateway/gateway-core.ts
       > diff --git a/packages/spaces-integration-gateway/gateway-core.ts b/packages/spaces-integration-gateway/gateway-core.ts
       > index 2fac038..94e9c0d 100644
       > --- a/packages/spaces-integration-gateway/gateway-core.ts
       > +++ b/packages/spaces-integration-gateway/gateway-core.ts
       > @@ -113,8 +113,7 @@ export interface McpStep {
       >  }
       >  
       >  export type McpExchangeResult =
       > -  | { ok: true; reply: Record<string, unknown> }
       > -  | { ok: false; reason: string };
       > +  { ok: true; reply: Record<string, unknown> } | { ok: false; reason: string };
       >  
       >  /**
       >   * One MCP exchange on a fresh unix-socket connection, the "MCP wire". It speaks
       For full logs, run:
         nix log /nix/store/l1qf7fjgn4vdd2wdpswwjh47hy9p65r9-treefmt-check.drv