fix: discocirc sandwich

[zxq82lm]

PR objective

Address this issue: #200

Fix

Whenever an n-typed node has children, _find_head_noun() picks the actual head noun ("programmer" in the example below). We then use that noun as the cursor for the rest of the build, so modifiers attach to the correct wire.

Testing

Unit test

python -m pytest tests/test_discocirc_reader.py

Sentence from the issue

"John creates a complicated application. He is a very talented programmer".

Before:

After: