release: merge svil → main for v2.5.8 (Osmium Sound rebranding) Includes: - feat(website): GitHub Pages presentation site - fix(website): corrections and Osmium Sound rename - ci(website): Pages deploy via gh-pages branch - feat(branding): rebrand to Osmium Sound (Plymouth, ISO, UI, OTA migration 0003) - docs(readme): rebrand to Osmium Sound Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>