[Feature] CI/CD pipeline: annotation scanning and testing in build

[ElioNeto]

Overview

Set up a CI/CD pipeline (GitHub Actions) that runs the annotation scanner, validates the route map, executes tests, and builds release artifacts automatically on every push and pull request.

Acceptance Criteria

• GitHub Actions workflow runs on every PR to main
• Pipeline steps:
  1. Lint (Go, TypeScript, Python)
  2. vyx annotate — validates all annotations and fails on errors
  3. Unit and integration tests (core + workers)
  4. vyx build — produces the core binary and worker bundles
• On push to main: build artifacts are published as a GitHub Release
• Test coverage report posted as a PR comment
• Workers can be tested by mocking the core or using a test core instance

References

• Spec §9.3 – Continuous Integration
• Roadmap – Phase 3