Fix installer fallback and version bump workflow

[DeanoC]

Summary

• avoid exiting early when share-tree deletion needs sudo during install upgrades
• let bump-version.sh succeed before CHANGELOG.md is updated
• address the two Codex review findings left on PR Release Spiderweb 0.5.1 #179

Testing

• bash -n install.sh scripts/bump-version.sh
• tmpdir=$(mktemp -d) && rsync -a --exclude .git ./ "$tmpdir/" >/dev/null && cd "$tmpdir" && ./scripts/bump-version.sh --patch
• mocked shell test covering copy_spidervenoms_share_tree and copy_spiderweb_share_tree sudo fallback path

[chatgpt-codex-connector]

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