[M1-T03] Set up CI workflow for RuleZ UI

[RichardHightower]

Task: M1-T03

Milestone: M1 - Project Setup (1 day)
Feature: RuleZ UI

Description

Create GitHub Actions CI workflow for RuleZ UI with Bun-based tooling.

Acceptance Criteria

• Create .github/workflows/rulez-ui.yml
• Configure Bun installation
• Add lint, typecheck, test stages
• Configure Tauri build for release artifacts

Workflow Stages

1. Lint - bun run lint
2. Typecheck - bun run typecheck
3. Test - bun run test
4. Build - bun run build:tauri (on release)

Dependencies

• Depends on: M1-T01

[RichardHightower]

Completed in PR #72 - RuleZ UI Milestone 1 scaffold implemented