- Dropped `onShowHotkeys` callback and its binding from `CustomEditor` and `InputController`.
- `?` now inserts a literal question mark regardless of editor state; use `/hotkeys` explicitly.
- Added regression test confirming `?` is treated as plain input when the editor is empty.
- Migrated test mocking from bun:test mock API to vitest spyOn pattern across 9 test files.
- Extracted mock setup logic into reusable helper functions with Symbol.dispose cleanup pattern.
- Replaced manual beforeEach/afterEach and try-finally blocks with TypeScript 5.2 using declarations.
- Removed 178 lines of boilerplate mock initialization and restoration code from test suite.
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