Rename Backup/ → OriginalSource/ (descriptive name for the historical-reference folder)

[andreak3779]

Summary

Renames the historical-reference folder from Backup/ to OriginalSource/ so the folder name describes what it actually contains: the original .NET Framework 1.0 WinForms source code, preserved verbatim for reference, never built, never referenced by new code.

This is a pure-rename PR. No production logic, no test logic, no docs content change — just folder rename + 27 reference updates.

Branch	phase/8-rename-original-source → upgrading-to-net-10 (this branch)
Base	main
Commit	5ca5ecc — checkpoint(phase-8): rename Backup/ to OriginalSource/
Tag	v0.8-rename-original-source

Why

Backup/ was a generic name that didn't tell a new reader what the folder was. The folder holds the original WinForms source code (verbatim, from before the .NET 10 upgrade), kept for historical reference per AGENTS.md. A new contributor opening the folder would find ComCookingTime.cs, frmCookingTime.cs, etc. — i.e., the original source of the project.

OriginalSource/ makes that explicit at a glance. It's the vocabulary Microsoft's .NET Upgrade Assistant uses for the same idea.

What changes

• 13 files renamed Backup/* → OriginalSource/* (git recorded the renames as R, so git log --follow and git blame still work).
• 14 text references updated across:
  • AGENTS.md — 5 references: the "no using legacy types" rule, the anti-pattern table, the repo-layout section.
  • README.md — 1 reference: the "legacy code preserved" link.
  • CookingTime.csproj — 1 reference: the <EnableDefault*Items> workaround comment.
  • coverlet.runsettings.xml — 2 references: the filter rules + the namespace explanation comment.
  • scripts/check-coverage.py — 1 reference: the PRODUCTION_FOLDERS comment.
  • docs/plan.md — 2 references: master plan goal + Phase 6 summary.
  • docs/decisions/0004-solid-and-patterns.md — 1 reference: the legacy-file citation in the SOLID contract.
  • docs/decisions/0006-coverage-tooling.md — 1 reference: the coverlet runsettings filter description.
  • docs/phases/phase-1-blazor-host.md — 1 reference: the inventory of files kept as historical reference.
  • docs/phases/phase-2-domain.md — 3 references: provenance comments for Weight, ChickenMeal, TurkeyMeal.
  • docs/phases/phase-3-application-and-config.md — 1 reference: the bug-fix citation.
  • docs/phases/phase-6-cleanup.md — 5 references: scope, decisions, anti-patterns.
  • docs/phases/phase-7-ci.md — 2 references: the coverlet exclude rule + the namespace explanation.
  • Domain/Meals/ChickenMeal.cs — 1 reference: the /// provenance comment.
  • Domain/Meals/TurkeyMeal.cs — 1 reference: the /// provenance comment.

The two /// comments in ChickenMeal.cs and TurkeyMeal.cs document where the domain tables came from. They stay as provenance, not dependencies — the new code doesn't import anything from OriginalSource/.

Diff summary

28 files changed, 44 insertions(+), 42 deletions(-)

Of those 28:

• 13 are file renames (Backup/X → OriginalSource/X) — 100% similarity.
• 15 are in-place text edits.

Out of scope

• OriginalSource/ contents are not changed. Every original WinForms file (.cs, .resx, .csproj, .sln, .suo, .ico) is preserved verbatim. Only the folder name changed.
• No build changes. CookingTime.csproj comment was updated, but the <EnableDefault*Items> workarounds are still required — OriginalSource/*.resx still has non-string resources that would be auto-included without them.
• No CI changes. The coverlet exclude pattern [OriginalSource.*] replaces [Backup.*]; same behavior.

Validation

• dotnet build -c Release — 0 warnings, 0 errors across all 4 projects.
• dotnet test -c Release --settings coverlet.runsettings.xml — 118 facts, 0 failed, 0 skipped.
• python3 scripts/check-coverage.py ... --threshold 75 — exits 0 (UnitTests at 80.00% lines).
• git grep -n 'Backup/' -- ':!OriginalSource' — no matches outside OriginalSource/ and the meta-reference in CookingTime.csproj ("renamed from Backup/ in Phase 8").

How to verify locally

git fetch origin
git checkout phase/8-rename-original-source
dotnet build -c Release
dotnet test -c Release --settings coverlet.runsettings.xml
python3 scripts/check-coverage.py \
  "$(ls -t tests/CookingTime.UnitTests/TestResults/*/coverage.cobertura.xml | head -1)" \
  --threshold 75

Checklist

• Branch: phase/8-rename-original-source
• Cuts from: upgrading-to-net-10 (the v0.7-ci tip)
• Checkpoint commit: checkpoint(phase-8): rename Backup/ to OriginalSource/
• Tag: v0.8-rename-original-source
• All 27 references updated across 16 files
• Build + tests + coverage gate green
• AGENTS.md still accurate
• No production-code changes