Bug: remaining-tracked-backup-files-and-hygiene-guard-rule #961

• Work Mode: minor-audit

Summary

#951 (PR #960) removed the eight tracked *.csproj.bak files and added an ignore rule. Two gaps remain:

• three other tracked backup files on main;
• no CI rule preventing a forced add from reintroducing them.

An ignore rule does not stop git add -f.

Environment

• OS/version: n/a
• Python version: n/a
• Command/flags used: git ls-tree -r --name-only origin/main | grep -E "\.bak$"
• Data source or fixture: repository tree at 9a3d2dd3e or later

Steps to Reproduce

1. List tracked .bak files on main:
   • TaskMaster.sln.bak
   • TaskTree/TaskTree.vbproj.bak
   • TaskVisualization/TaskVisualization.vbproj.bak
2. Force-add any *.csproj.bak. The hygiene guard reports nothing.

Expected Behavior

• No tracked backup files.
• The repository hygiene guard (Bug: evidence-and-identity-hygiene-sweep #927, scripts/hygiene/) fails CI when any tracked *.bak exists.

Actual Behavior

Three backups remain, and the guard has no backup-file rule.

Logs / Screenshots

• Attached minimal logs or screenshot
• Snippet: Bug: tracked-csproj-bak-files-carry-stale-project-content #951 executor follow-ups 1 and 2 (PR chore: remove tracked csproj.bak backups and ignore the pattern #960).

Impact / Severity

• Blocker
• High
• Medium
• Low

Source

From: docs/features/potential/2026-10-01-remaining-tracked-backup-files-and-hygiene-guard-rule.md