Add hover.md with examples of hover assertions across different expression types. Some tests still need arrow alignment fixes, but many sections are passing including basic literals, function definitions, comprehensions, and the simple hover test file. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
Markdown files within the mdtest/ subdirectory are tests of type inference and type checking;
executed by the tests/mdtest.rs integration test.
See crates/ty_test/README.md for documentation of this test format.