chore: remove the JustDummies source from this repository

.github/dependabot-autofix-prompt.md

@@ -65,7 +65,7 @@ The header must match `<type>[(<scope>[,<scope>...])][!]: <lowercase description
 
 - **type**: one of `feat, fix, build, chore, ci, docs, perf, refactor, revert,
   style, test`. Dependabot uses `build` (NuGet) or `ci` (GitHub Actions).
-- **scope** (optional): one of `core, analyzers, binder, cli, justdummies, gendoc,
+- **scope** (optional): one of `core, analyzers, binder, cli, gendoc,
   testing`. A dependency bump has no natural scope — **omit it**. `deps` is **not**
   a valid scope here.
 - **description**: imperative, lowercase first letter, no trailing period; whole

.github/workflows/changelog.yml

@@ -7,7 +7,6 @@ name: Draft changelog
 # before merging. The trains version independently and keep separate changelogs:
 #   lib -> CHANGELOG.md                     (FirstClassErrors + FirstClassErrors.Testing + FirstClassErrors.RequestBinder)
 #   cli -> FirstClassErrors.Cli/CHANGELOG.md (the fce .NET tool)
-#   dum -> JustDummies/CHANGELOG.md             (the standalone JustDummies library)
 on:
   workflow_dispatch:
     inputs:
@@ -17,7 +16,6 @@ on:
         options:
           - lib
           - cli
-          - dum
         required: true
       from_ref:
         description: "Previous tag to diff from. Leave blank to auto-detect the train's latest tag; if the train has no tag yet, the whole history is used."
@@ -92,7 +90,7 @@ jobs:
           tools/changelog/collect-prs.sh "$COMPONENT" > prs.json
           echo "count=$(jq 'length' prs.json)" >> "$GITHUB_OUTPUT"
           echo "Collected $(jq 'length' prs.json) ${COMPONENT}-facing pull request(s) for this changelog."
-        # COMPONENT is a choice input (lib|cli|dum only), safe to pass straight through.
+        # COMPONENT is a choice input (lib|cli only), safe to pass straight through.
         # from_ref is free text, so it travels via the environment (never inlined
         # into the script) and is only ever passed to git (rev-parse, then log) as a ref argument.
 

.github/workflows/ci.yml

@@ -98,24 +98,17 @@ jobs:
       # Only these library test projects carry the net472 leg (EnableNet472Floor adds it): the tooling test
       # projects (Roslyn / GenDoc / Cli) stay net10-only by design, and RequestBinder.UnitTests stays net10-only
       # because its fixtures bind DateOnly, a .NET 6+ type absent from net472. RequestBinder is still floored here
-      # through its property tests, and JustDummies through its own contract suite (JustDummies.UnitTests), running on the
-      # netstandard2.0 asset .NET Framework consumers load — its net8-only tests are conditioned out (issue #215).
-      # JustDummies.Xunit is floored the same way: it ships netstandard2.0, so a .NET Framework consumer loads that
-      # asset, and its adapter suite must prove it works there and not only on net10. JustDummies.PropertyTests
-      # joins them so the generator INVARIANTS, not just the example-based contract, hold on the floor.
+      # through its property tests.
       # A per-project loop (not a solution-wide -f net472, which would force the TFM onto the net10-only projects
-      # and fail) keeps the net472 scope exactly these six.
+      # and fail) keeps the net472 scope exactly these three.
       - name: Test the netstandard2.0 libraries on .NET Framework 4.7.2
         shell: bash
         run: |
           set -euo pipefail
           for proj in \
             FirstClassErrors.UnitTests \
             FirstClassErrors.PropertyTests \
-            FirstClassErrors.RequestBinder.PropertyTests \
-            JustDummies.UnitTests \
-            JustDummies.PropertyTests \
-            JustDummies.Xunit.UnitTests ; do
+            FirstClassErrors.RequestBinder.PropertyTests ; do
             echo "::group::$proj (net472)"
             dotnet test "$proj/$proj.csproj" -c Release -f net472 -p:EnableNet472Floor=true \
               --logger "console;verbosity=normal"

.github/workflows/dependabot-autofix.yml

@@ -53,7 +53,6 @@ on: # zizmor: ignore[dangerous-triggers]
       - sonar
       - analyzers
       - commit-lint
-      - justdummies
       - dependency-review
       - codeql
     types: