[Mresyzz]

Problem

GitHub Repository Search now finds the repository for the Debian/Ubuntu/Alpine and runtime-compatibility queries, but cross distro shell test still returned no result. The missing signal was the shell testing / shell-test vocabulary.

What changed

• Added natural cross-distro shell testing and shell script compatibility checker wording to the README and search metadata.
• Updated the Action description, PyPI summary, llms.txt, and Pages descriptions with the same category language.
• Replaced low-signal topics with cross-distro-testing and shell-test while retaining command-not-found, distro, runtime, and compatibility topics.

GitHub Repository Search verification

• cross distro shell test: Mresyzz/opsscript-gate is result 1.
• cross-distro shell testing: Mresyzz/opsscript-gate is result 1.
• runtime compatibility shell: remains in the top results.
• shell portability runtime test: no relevant result; this query is noisy and was not added as a misleading topic.

Validation

• git diff --check passed.
• README, HTML, Action metadata, and pyproject.toml parsed successfully.
• Runtime behavior is unchanged.