test: add CI includeBoardFiles edge-case reproduction for site builds

[seveibar]

Motivation

• Reproduce an edge case where includeBoardFiles is configured but matches no files, causing tsci build --ci --concurrency 4 to produce a site shell and transpiled library output but no built circuit.json artifacts (an “empty” site).

Description

• Add a focused test tests/cli/build/build-ci-site-include-board-edge-case.test.ts that writes a minimal project config with mainEntrypoint, previewComponentPath, siteDefaultComponentPath, includeBoardFiles, alwaysUseLatestTscircuitOnCloud, and prebuildCommand, runs tsci build --ci --concurrency 4, and asserts the site + transpile outputs exist while no circuit.json files are produced and the static file list in index.html is empty.

Testing

• Ran the new test with bun test tests/cli/build/build-ci-site-include-board-edge-case.test.ts and it passed.
• Ran typecheck with bunx tsc --noEmit which succeeded.
• Ran formatter with bun run format which completed successfully.

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Codex Task

[github-actions]

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