[dxnnystyles]

Summary

adds temporary-tree tests for stale explainer counts, --fix, missing listings, and all seven count patterns. raises checker coverage from 61.4035% (35/57) to 98.2456% (56/57).

Type

• Audit
• Explainer
• Bug fix
• Other (tests)

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How I Tested

• focused tests: 9 passed; checker coverage 56/57 statements (98.2456%), up from 35/57 (61.4035%)
• fast suite: 973 passed, 54 skipped, 2 deselected
• ruff check faircode scripts tests, git diff --check, and python scripts/check_explainer_count.py passed
• make lint stops on existing closed-issue references in ROADMAP.md (JSON string cells "NA" and "" are missing in the web engine and ordinary values in Python #1036, XLSX date cells are labelled 2020-01-01 00:00:00 by Python and by their serial number (43831) by the web engine #1039, Numeric column headers keep their type in Python (the integer 2020) and are text in the web engine #1045, Two long group labels that share their first 29 characters still print identically after the ellipsis fix #1038); em-dash and broken-link checks passed
• ruff format --check flags formatting already present in the upstream test file
• full slow suite not run

Linked issue

Closes #1153

[vercel]

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[github-actions]

@yakew7 @ahmdkaml - new PR touching a path you own, please review.