[Chemaclass]

Background

CI failed in Windows summary tests, reported unsupported permission tests as risky, and exited before existing network skip checks in strict mode. Release asset downloads and duplicate Alpine sequential coverage also delayed or failed CI.

Changes

• Initialize summary test state directly and report unsupported directory permission tests as skipped.
• Let existing download and binary checks classify command failures in strict mode.
• Fetch pinned ShellCheck through the GitHub API, run make sa, and retain .bash coverage while excluding the intentional syntax-error fixture.
• Keep both Alpine parallel modes, remove the duplicate sequential job, and use the existing offline flag for Alpine tests. Sequential execution and live download tests remain on other platforms.

Validation: focused parallel and strict tests, forced download failure cases, ShellCheck, lint, YAML parsing, and review passed. The offline install and upgrade tests reported 19 passes and 12 skips. All 37 CI checks passed on the final commit. Alpine extended finished in 1m 56s and simple in 3m 9s; the duplicate sequential job was removed.

Checklist

• Changelog reviewed: contributor test and CI changes only, no public behavior change
• Documentation reviewed: no public API or usage change

[Chemaclass]

Review found one ShellCheck coverage regression.