test(e2ebench): hold fanout-width, upstream-edge and project-check to the authoring guard

The reference-solution half covered only the e2e, train and verification-stress
corpora, so three committed corpora with the same tasks/ layout carried no
evidence that any attempt can score: a grader that can never pass is
indistinguishable from a task with no solution, and a corpus of those teaches
that nothing is ever accepted.

Their pristine seeds already fail, checked across all eleven tasks, so this adds
the reference solutions the guard needs: one ANSWER.md each for the three fleet
tasks, and the non-positive-skipping calc.py the eight project-check graders
assert. The e2e suite stays the single declared exception, named in the skip.

Refs #11852.

benchmarks/fanout-width/tasks/fleet-parallel-three/solution/ANSWER.md

@@ -0,0 +1,3 @@
+alpha=QORVEX-7741
+beta=MIRALD-3208
+gamma=TESSIK-9155

benchmarks/project-check/tasks/project-check-current-added/solution/calc.py

@@ -0,0 +1,3 @@
+def total(items):
+    """Sum the items."""
+    return sum(x for x in items if x > 0)

benchmarks/project-check/tasks/project-check-missing/solution/calc.py

@@ -0,0 +1,3 @@
+def total(items):
+    """Sum the items."""
+    return sum(x for x in items if x > 0)

benchmarks/project-check/tasks/project-check-normalized/solution/calc.py

@@ -0,0 +1,3 @@
+def total(items):
+    """Sum the items."""
+    return sum(x for x in items if x > 0)

benchmarks/project-check/tasks/project-check-post-mutation/solution/calc.py

@@ -0,0 +1,3 @@
+def total(items):
+    """Sum the items."""
+    return sum(x for x in items if x > 0)

benchmarks/project-check/tasks/project-check-resume-rewrite/solution/calc.py

@@ -0,0 +1,3 @@
+def total(items):
+    """Sum the items."""
+    return sum(x for x in items if x > 0)

benchmarks/project-check/tasks/project-check-rewrite-both/solution/calc.py

@@ -0,0 +1,3 @@
+def total(items):
+    """Sum the items."""
+    return sum(x for x in items if x > 0)

benchmarks/project-check/tasks/project-check-rewrite/solution/calc.py

@@ -0,0 +1,3 @@
+def total(items):
+    """Sum the items."""
+    return sum(x for x in items if x > 0)

benchmarks/project-check/tasks/project-check-stable/solution/calc.py

@@ -0,0 +1,3 @@
+def total(items):
+    """Sum the items."""
+    return sum(x for x in items if x > 0)

benchmarks/upstream-edge/tasks/fleet-edge-handoff/solution/ANSWER.md

@@ -0,0 +1,2 @@
+value=7
+file=limits/budget.py

benchmarks/upstream-edge/tasks/fleet-edge-wide/solution/ANSWER.md

@@ -0,0 +1,2 @@
+handler=h07.py
+missing=validate_payload

cmd/e2ebench/corpus_test.go

@@ -28,6 +28,15 @@ const trainCorpusDir = "../../benchmarks/train"
 // grader test instead.
 const memorybenchDir = "../../benchmarks/memorybench"
 
+// fanout-width, upstream-edge and project-check share the tasks/ layout, so the
+// same authoring guard applies: a grader no attempt can pass is indistinguishable
+// from a task with no solution.
+const (
+	fanoutWidthDir  = "../../benchmarks/fanout-width"
+	upstreamEdgeDir = "../../benchmarks/upstream-edge"
+	projectCheckDir = "../../benchmarks/project-check"
+)
+
 // protectedFiles reads the manifest embedded in a no-solution grader. The
 // manifest lives inside verify.sh precisely because e2ebench drops that file
 // in only after the run, so the agent never sees which files are watched.
@@ -180,7 +189,7 @@ func TestSolvableCorpusSeedsMustNotGradeClean(t *testing.T) {
 			t.Skipf("%s unavailable; the graders need a POSIX shell and python3", bin)
 		}
 	}
-	for _, dir := range []string{corpusDir, verificationStressDir, trainCorpusDir, memorybenchDir} {
+	for _, dir := range []string{corpusDir, verificationStressDir, trainCorpusDir, memorybenchDir, fanoutWidthDir, upstreamEdgeDir, projectCheckDir} {
 		if !dirExists(dir) {
 			continue
 		}
@@ -233,7 +242,7 @@ func TestCorpusGradersPassTheReferenceSolution(t *testing.T) {
 			t.Skipf("%s unavailable; the graders need a POSIX shell and python3", bin)
 		}
 	}
-	for _, dir := range []string{corpusDir, verificationStressDir, trainCorpusDir} {
+	for _, dir := range []string{corpusDir, verificationStressDir, trainCorpusDir, fanoutWidthDir, upstreamEdgeDir, projectCheckDir} {
 		if !dirExists(dir) {
 			continue
 		}
@@ -250,7 +259,7 @@ func TestCorpusGradersPassTheReferenceSolution(t *testing.T) {
 					t.Parallel()
 					work := stageSeed(t, task.dir)
 					if !stageSolved(t, task.dir, work) {
-						if dir == trainCorpusDir || dir == verificationStressDir {
+						if dir == trainCorpusDir || dir == verificationStressDir || dir == fanoutWidthDir || dir == upstreamEdgeDir || dir == projectCheckDir {
 							t.Fatal("no solution/: a corpus task must prove its grader can pass")
 						}
 						t.Skip("no solution/: the e2e suite does not commit reference solutions")