## What changed
- Reject unsupported flowchart shapes and Markdown strings so the terminal renderer preserves the source with an unsupported-feature notice instead of misrendering it. Keep ordinary quoted labels containing shape-like punctuation valid.
- Preserve class relationship targets beginning with `o`, such as `A --orange`, instead of consuming the first letter as an aggregation marker.
- Accumulate state aliases and descriptions in source order: use the first as the title and subsequent entries as body rows, preserving state identity and limiting body rows to 16.
## Testing
Add parser regressions for these cases and description limits, update class and state snapshots, and extend TUI snapshots to verify source preservation for unsupported flowchart syntax.
GitOrigin-RevId: c44d954312c77229a3752a0d9ada14e34a43a376
Eric Traut
6e1ab4d294