Add comprehensive test coverage for pkg/color, pkg/errors, domain, internal/xml, internal/serializer, and builder API #19

	name: CI

	on:
	push:
	branches: [ main, dev ]
	pull_request:
	branches: [ main, dev ]

	jobs:
	lint-and-test:
	name: Lint, Build and Test
	runs-on: ubuntu-latest
	steps:
	- name: Set up Go
	uses: actions/setup-go@v4
	with:
	go-version: '1.23.x'
	cache: false # No external dependencies, so no need to cache

	- name: Check out code
	uses: actions/checkout@v4

	- name: Run golangci-lint
	uses: golangci/golangci-lint-action@v8
	with:
	version: v2.5.0
	args: --timeout=5m
	only-new-issues: ${{ github.event_name == 'pull_request' }}

	- name: Get dependencies
	run: go mod download

	- name: Build
	run: go build -v ./...

	- name: Run tests
	run: go test -v ./...

	- name: Test examples
	run: \|
	cd examples
	chmod +x test_all.sh
	./test_all.sh

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