Use lowercase names for cronic's variables, so that it does not change the caller's exported variables

[mernst]

cronic assigned variables with common names such as DEBUG, OUT, ERR, TRACE, and RESULT. If the caller had exported a variable with one of those names, cronic changed its value, and the wrapped command saw cronic's value rather than the caller's.

This pull request gives all of cronic's variables lowercase names that start with cronic_, matching the prefix that its functions already have. By convention, exported (environment) variables are uppercase, so lowercase names do not clash with them. It also adds a test that derives the names of the variables from cronic itself and checks that the wrapped command sees the caller's exported value for each name in uppercase, both with and without the CRONIC_ prefix.

This is split out of #129, which relies on the prefixes.

[coderabbitai]

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ℹ️ Recent review info

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Reviewing files that changed from the base of the PR and between d37c363 and 0c3b540.

📒 Files selected for processing (2)

• cronic
• tests/cronic-test/cronic-test.sh

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📝 Walkthrough

Walkthrough

The script renames option-state and temporary-file variables to lowercase cronic_* names. Existing option handling, command execution, stderr processing, reports, and exit status remain unchanged. A new test checks that caller-exported values reach the wrapped command unchanged.

Priority: ⬇️ Low

Change: Bug fix

Merge Risk: ⚪ Minimal · up to 0c3b5

The variable rename is covered against the prior uppercase-variable collision; no actionable merge-blocking risk remains in these changes.

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Docstring Coverage		No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 1…
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.

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