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Sandbox not functioning as expected

See original GitHub issue

Describe the issue Following the Quick Start guidance proves unfruitful for sandbox mode on macOS

Steps to reproduce Steps to reproduce the behavior: environment

node --version
v10.16.3

which node
/Users/jdavila/.nvm/versions/node/v10.16.3/bin/node

which arc
/Users/jdavila/.nvm/versions/node/v10.16.3/bin/arc

.arc

@app
init

@http
get /

@aws
runtime nodejs10.x
profile default
region us-east-1
bucket arc-codes-testing

Steps

arc sandbox which produces

$ arc sandbox
   App ⌁ init
   Region ⌁ us-east-1
   Profile ⌁ default
   Version ⌁ Architect 6.0.28
   cwd ⌁ /Users/jdavila/Repos/arc-tinker

  ✓ Sandbox Found Architect manifest, starting up
  ✓ Sandbox Project files hydrated into functions
  ✓ Sandbox Loaded routes
      get / ................................. get-index

  ✓ Sandbox Sandbox started in 60ms
  ✈︎ Local environment ready!

      http://localhost:3333

Then navigate to http://localhost:3333 in the browser
Get generic Not Found browser page

Terminal displays

/Users/jdavila/.nvm/versions/node/v10.16.3/lib/node_modules/@architect/architect/node_modules/@architect/sandbox/src/invoke-lambda/index.js:48
     runtimes[runtime](options, timeout, callback)
                   ^

TypeError: runtimes[runtime] is not a function
    at done (/Users/jdavila/.nvm/versions/node/v10.16.3/lib/node_modules/@architect/architect/node_modules/@architect/sandbox/src/invoke-lambda/index.js:48:24)
    at done (/Users/jdavila/.nvm/versions/node/v10.16.3/lib/node_modules/@architect/architect/node_modules/@architect/sandbox/src/invoke-lambda/get-config.js:18:7)
    at FSReqWrap.readFileAfterClose [as oncomplete] (internal/fs/read_file_context.js:53:3)

Expected behavior I would expect it to work as described in the docs

Screenshots If applicable, add screenshots to help explain your problem

Desktop Please complete the following information (if appropriate):