Documents:
- Complete session history and what was accomplished
- ACE → CodeMirror migration rationale and steps
- Flex layout height constraint fix pattern
- Key technical learnings (CJS/ESM interop, flex layouts)
- Remaining steps organized by priority (high/medium/low)
- Continuation prompt template for next session
- MVP success criteria (all ✅ complete)
This serves as the handoff document for the next developer
or AI agent continuing work on User Mode.
