style: POSIX character classes in tr (5q6.7)

[R0SEWT]

Closes project-kit-5q6.7.

ShellCheck (the lint CI job) was failing on scripts/scaffold.sh:57: tr 'A-Z' 'a-z' trips SC2019/SC2018 (plain ranges don't cover accented/foreign alphabets). The action exits 1 on any finding, so main was red and the repo's first PR (#1) inherited it.

Fix: tr '[:upper:]' '[:lower:]'. No behavior change for ASCII project names; turns lint green.

Pre-existing since 964a15b (the 5q6.2 scaffold feat), discovered while landing the 5q6.3 doc. Kept out of the docs PR to preserve one-intention-per-branch.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Updates the package name normalization in the scaffold script to use POSIX character classes in tr, resolving ShellCheck SC2018/SC2019 while preserving behavior for ASCII names.

File-Level Changes

Change	Details	Files
Use POSIX character classes in package name normalization to satisfy ShellCheck and keep behavior consistent for ASCII inputs.	Replace tr 'A-Z' 'a-z' with tr '[:upper:]' '[:lower:]' in the package name derivation pipeline. Retain the preceding sed replacement that maps non-alphanumeric characters to underscores, so overall normalization semantics are unchanged apart from improved locale/charset correctness.	scripts/scaffold.sh

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[Copilot]

Pull request overview

Updates the scaffold script’s case-normalization step to satisfy ShellCheck’s guidance around locale-aware character ranges, restoring a green lint job without changing behavior for ASCII-only project names.

Changes:

• Replace tr 'A-Z' 'a-z' with tr '[:upper:]' '[:lower:]' when deriving PKG from NAME.

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