Kyle Isom 15b350bfaa Add TestHarness infrastructure and initial smoke test ...

- Implemented `TestHarness` class for headless editor testing.
- Added utility methods for text insertion, editing, and querying.
- Introduced `test_daily_driver_harness` for verifying basic text buffer operations.
- Updated CMake to include the new test files.

2026-02-10 23:34:01 -08:00

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