Lab: env var overrides for globalArguments silently change which environment a model targets

Description

When a model is configured with globalArguments for a specific environment (e.g., prod-jenkins with baseUrl: http://10.155.16.20:8080), the resolveConnectionOpts pattern of falling back to env vars like JENKINS_BASE_URL makes it possible to accidentally run a prod-named model against dev infrastructure (or vice versa).

This is risky because:

Swamp data artifacts are stored under the model name, so prod-jenkins data would contain dev results
It's not obvious from the command invocation which environment is actually being targeted
Workflows referencing data.latest("prod-jenkins", ...) would get contaminated data

Expected Behavior

Users should create a separate model per environment (e.g., prod-jenkins, dev-jenkins) rather than overriding globalArguments via env vars. Swamp could help enforce this by:

Warning when env vars override model globalArguments
Providing a --env flag on model method run that selects a pre-configured environment variant
Documenting the one-model-per-environment pattern as a best practice

Steps to Reproduce

Create a model prod-jenkins with baseUrl: http://prod:8080
Run JENKINS_BASE_URL=http://dev:8080 swamp model method run prod-jenkins listPlugins
Data artifacts are stored under prod-jenkins but contain dev data

Environment

swamp version: 20260318.021802.0-sha.3848499d
OS: macOS Darwin 25.3.0

yep yep yep

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