Add env var uppercase validation

[benedikt-bartscher]

No description provided.

[greptile-apps]

Greptile Summary

Adds strict uppercase-name validation to EnvVar.

• Raises ValueError when an environment-variable name is not uppercase.
• Adds unit coverage for accepted uppercase and rejected mixed/lowercase names.

Confidence Score: 4/5

The PR should not merge until the new validation provides a compatibility or deprecation path for existing users of non-uppercase EnvVar names.

The constructor is reachable through importable Reflex modules and now turns previously valid inputs into immediate ValueError failures, while the tests explicitly establish this hard rejection as the intended behavior.

Files Needing Attention: packages/reflex-base/src/reflex_base/environment.py

Important Files Changed

Filename	Overview
packages/reflex-base/src/reflex_base/environment.py	Adds unconditional uppercase validation, introducing a compatibility break for previously accepted constructor inputs.
tests/units/test_environment.py	Adds focused parameterized tests covering the newly accepted and rejected name formats.

_{Reviews (1): Last reviewed commit: "format" | Re-trigger Greptile}

[greptile-apps]

Hard break for existing names

When downstream code constructs EnvVar through reflex.config.EnvVar or reflex_base.environment.EnvVar with an existing lowercase or mixed-case name, this unconditional check raises ValueError, causing application initialization or startup to fail without the required deprecation and fallback period.

Context Used: CLAUDE.md (source)

Knowledge Base Used: Config and Environment System

[codspeed-hq]

Merging this PR will not alter performance

✅ 26 untouched benchmarks
⏩ 8 skipped benchmarks¹

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_{Comparing benedikt-bartscher:add-env-var-uppercase-validation (5844415) with main (416eb34)}

Footnotes

1. 8 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

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