GSE-226: Fix local footer lockup override for stanford_basic SDC refactor (7.0.0)

[joegl]

Summary

GSE-226: DEV | Refactor gse_subtheme for Stanford Sites SDC and stanford_profile 13.x compatibility

• Restores the GSE local footer logo-only lockup, which broke after Stanford Sites moved the local footer to a Single Directory Component (SDC) and stanford_profile's config-pages--stanford-local-footer.html.twig stopped reading its lockup variables from preprocess. Fixed by renaming the preprocess hook (hook_preprocess_pattern_localfooter() → hook_preprocess_config_pages__stanford_local_footer()) and adding a template override (templates/config-pages--stanford-local-footer.html.twig) that feeds the lockup values from that hook instead of the site's config_pages fields. Also fixes a pre-existing bug where lockup_option was double-prefixed (su-lockup--option-su-lockup--option-none) and never matched any CSS class. Additionally bumps the theme version to semver (1.0.0), removes the one-time rename_theme.sh setup script, and documents the theme's customizations in the README.

Review By (Date)

• TBD

Criticality

• 4/10

Urgency

• Normal

Review Tasks

Setup tasks and/or behavior to test

1. Check out this branch
2. Rebuild Cache and import config drush cr ; drush ci
3. Navigate to any page and scroll to the local footer
4. Verify the local footer shows the GSE logo-only lockup ("Stanford Graduate School of Education" with the GSE logo image), regardless of what's configured on /admin/config/system/local-footer

Backend / Functional Validation

Code

• Are the naming conventions following our standards? Hook and variable names follow the naming stanford_basic 7.x now uses (preprocess_config_pages__stanford_local_footer, use_default_logo).
• Does the code have sufficient inline comments? Preprocess hook and template override both document why the override exists and what to do if stanford_basic changes the upstream template.
• Are there any code smells? The template override duplicates all of stanford_basic's config-pages--stanford-local-footer.html.twig, not just the lockup-related lines, because the upstream template uses include() rather than embed() with overridable blocks, so there's no smaller seam available. See README's Customizations section for the maintenance note.

General

• Is there anything included in this PR that is not related to the problem it is trying to solve? Yes, three small unrelated cleanups bundled in: bumping gse_subtheme.info.yml version to semver (1.0.0), removing the now-unneeded rename_theme.sh setup script, and documenting theme customizations in the README.
• Is the approach to the problem appropriate? Yes — matches the pattern used in the reference fix (first_step_subtheme#22).

Associated Issues and/or People

• GSE-226: DEV | Refactor gse_subtheme for Stanford Sites SDC and stanford_profile 13.x compatibility
• Reference fix: first_step_subtheme#22 ("refactor local footer for 7.0.0 release")