RESULT: FAILED

FILES CHANGED:
- renderer/html.py
- parser/blocks.py
- test_inline_escapes.py

SUMMARY:
Implemented punctuation escapes and named/numeric character references. Both declared scoped acceptances and focused tests pass.

BLOCKERS:
- `sh full_test.sh` fails on pre-existing tab/list/thematic-break behavior outside this story.

FAILURE_SUMMARY: Full CommonMark suite remains failing outside inline escapes.
FAILURE_DETAIL: Scoped escape/reference checks pass, but the complete suite fails in Tabs and Thematic breaks cases; fix block parsing before rerunning.