Environment variables on the CLI

Use -F / --env-file and -P / --preset to load variables from an env file, then override with -e:

testlight run tests/login.mmt -F env.mmt -P runner.dev

Apply multiple preset groups (same as the environment panel):

testlight run tests/login.mmt -F env.mmt -P runner.dev -P custom.prod

Override values explicitly (wins over preset):

testlight run tests/login.mmt -F env.mmt -P runner.dev \
  -e api_url=http://localhost:8080 -e user=bob

Without an env file, pass variables directly:

testlight run tests/login.mmt -e api_url=http://localhost:8080 -e user=alice -e pass='00123'

Typing rules: unquoted numbers and booleans are coerced (true, 42); quoted values stay strings ('00123').

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