Fix: prevent environment hijacking/crash in multi-site setups

[Dana-Johnson]

The Issue:
In multi-site environments, the CLI's checkEnvironment shortcut can globally hijack the process environment. If one registered site is missing a config.production.json while others are running, the CLI may attempt to force a global development mode, leading to crashes or state pollution.

The Fix:
Modified checkEnvironment in lib/instance.js to only allow the automatic development-mode fallback if the CLI is managing a single instance. In multi-site configurations, the CLI now bypasses this shortcut, maintaining environment stability across the stack.

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Reviewing files that changed from the base of the PR and between 6d5b9db and f01347c.

📒 Files selected for processing (1)

• lib/instance.js

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