Align package.json license with BUSL-1.1 + add CI

[erinepshovel-code]

License alignment

The LICENSE file declares Business Source License 1.1 intent (SPDX-License-Identifier: BUSL-1.1, Change Date 2030-01-01, converting to Apache-2.0), but package.json still declared "license": "MIT". The LICENSE file explicitly flagged this as a required follow-up:

NOTE: package.json currently declares "license": "MIT". Update it to "BUSL-1.1" to match this file before release.

This PR is that follow-up. It changes the "license" field in package.json from "MIT" to the SPDX identifier "BUSL-1.1". No other fields in package.json were touched.

CI

Adds a minimal GitHub Actions workflow at .github/workflows/ci.yml that runs on pushes to main and on pull requests:

• checkout
• setup-node (Node 20, with npm cache)
• npm ci
• npm run check (TypeScript type-check via tsc)
• npm run build

No database-dependent step is included (the db:push script is intentionally excluded).

https://claude.ai/code/session_01Dz9UKMLXExfvk3XCY6mG7W

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