core: tsconfig.json excludes test files, breaking eslint

[bpowers]

Problem

src/core/tests/datamodel.test.ts fails eslint with:

parserOptions.project has been provided for @typescript-eslint/parser. The file was not found in any of the provided project(s).

The @simlin/core package's tsconfig.json does not include test files in its include or files configuration. Because @typescript-eslint/parser is configured with parserOptions.project pointing to this tsconfig, it cannot perform type-aware linting on any test files.

Why it matters

This blocks the pre-commit hook for ALL commits, regardless of which files are changed. The hook runs TypeScript linting across the workspace, which includes src/core/tests/, and the parser error causes a hard failure.

Component(s) affected

• src/core (tsconfig.json configuration)
• Pre-commit hook (scripts/pre-commit)

Possible approaches

1. Add a tsconfig.test.json that extends tsconfig.json and includes the tests/ directory, then configure the eslint override for test files to use it.
2. Add tests/**/*.ts to the existing tsconfig.json include array.
3. Configure eslint to use a separate parser options project for test files.

Option 2 is simplest but may pull test types into the production build. Option 1 is the standard pattern for TypeScript projects that separate test and production compilation.

Context

Identified as a pre-existing infrastructure issue blocking the pre-commit hook for all commits.