fix(ci): ensure build runs before tests in workflows

[TabishB]

Summary

• Fixed test failures by ensuring TypeScript build runs before tests
• Added comprehensive CI workflow for pull requests with matrix testing
• Moved build step to run immediately after dependency installation

Problem

Tests were failing with ERR_MODULE_NOT_FOUND because the dist/ directory didn't exist when tests tried to run the CLI binary. The binary imports from dist/cli/index.js but the build hadn't run yet.

Solution

1. Fixed release-publish.yml: Moved pnpm run build to run immediately after pnpm install and before any validation/test steps
2. Added ci.yml workflow: Created comprehensive CI pipeline that runs on all PRs with:
   • Matrix testing across Node 18, 20, 22
   • Cross-platform testing (Ubuntu, macOS, Windows)
   • Type checking and build verification
   • Test coverage artifact upload
   • Proper caching for faster CI runs

Test plan

• Verify workflow syntax is correct
• CI workflow runs successfully on this PR
• All tests pass with proper build order
• Matrix testing works across Node versions and platforms

🤖 Generated with Claude Code