No SDK, no framework: quickstart.sh calls a system's
vendor-shaped REST API with curl, then speaks MCP to the same system by hand
(initialize → initialized → tools/list). Read it top to bottom and you know
how Era looks on the wire.
era new --industry fintech --size mid --systems slack # once
export SLACK_BASE_URL=... # from `era mcp <tenant>` / the written .env
export SLACK_MCP_URL=...
export SLACK_MCP_HEADER=... # e.g. "Authorization: Bearer ..."
export ERA_TENANT_TOKEN=...
sh quickstart.sh