Summary

• add @opencode-ai/css, a zero-runtime plain CSS package for simple internal tools
• expose OpenCode tokens, light/dark themes, and a focused set of attribute-driven page, surface, table, badge, button, and native form styles
• support one-shot, granular, and CDN imports with a static internal-tool example
• add package verification and release publishing without making @opencode-ai/ui consume it

Checks

• bun test from packages/css (5 passed)
• bun pm pack --dry-run (18 intended files, 32.83 KB unpacked)
• Chromium fixture at 1440px/dark: no console or page errors; focus styles verified
• Chromium fixture at 390px/light and dark: no page overflow; table scroll container verified

Requested by: @thdxr (Dax Raad via Slack)