What is this?

Tooling-only fix for the weekly link-rot report. Blocked/unverifiable rows currently bypass the cell escaping used by the other report sections, so pipes in a tutorial title or fetched note create extra columns and @ text can be interpreted as a mention.

Pass the four cells through the existing escape_md_cell helper, using the same formatting style as the moved-links table.

Validation

• Local HTTP flow: HEAD 405, GET 200 with a soft-404 title, domain-policy classification as BLOCKED, then report generation. Pipe and mention controls fail on the original and pass after the fix.
• Ordinary dead, suspect, moved, and blocked reports remain byte-for-byte identical; empty blocked cells retain their existing display.
• python3 scripts/check_readme.py lint --json: exit 0, 457 entries, 0 errors and 0 warnings.
• Python syntax compilation passed on Windows with Python 3.12.

Checklist

• This is a tooling-only change.
• I ran the README validator locally and it exits 0.
• Tutorial URL, section placement, and author relationship checks are not applicable to this tooling change.

AI assistance: Codex investigated, implemented, and validated this tooling fix.