bible(corpus-check): warn on a verse present but stubbed vs the Vulgate

The count-based checks (gap, duplicate, missing chapter) only see a verse's
presence, so a verse that IS there but truncated -- a lost opening line, a merge
artifact, the exact class that lost 44 psalm openings and Acts 6:5 from the old
Wujek scrape -- passes silently.

Add a warning for it, compared CROSS-CORPUS to the aligned Vulgate verse (never
within the chapter). That is deliberate: a genuinely terse verse ("Non occides",
"Jesus wept") is short in the Vulgate too, so it is not flagged; only a corpus
stub against a substantial Vulgate verse fires (corpus <12 chars, <1/4 of a
Vulgate verse >=40). Rune-counted (script-agnostic) and skipped on the Psalms
when the corpus renumbers them (psalm_system != vulgate), where per-verse
alignment with the Vulgate would not hold.

Warning only, never an error. Zero false positives across vul/wuj/drb/grb;
a `stub` testdata fixture (Genesis 1:1 = "x") exercises a real hit.

1 files changed, 18 insertions, 1 deletions

diff --git a/internal/bible/validate_test.go b/internal/bible/validate_test.go
index 9cfec26..a3ed622 100644
--- a/internal/bible/validate_test.go
+++ b/internal/bible/validate_test.go
@@ -1,6 +1,9 @@
 package bible
 
-import "testing"
+import (
+	"strings"
+	"testing"
+)
 
 func TestCheckCorpus(t *testing.T) {
 	SetUserCorporaDir("testdata/corpora")
@@ -21,4 +24,18 @@ func TestCheckCorpus(t *testing.T) {
 	if r := CheckCorpus("badsystem"); r.OK() {
 		t.Fatal("bad psalm_system not caught")
 	}
+	// A verse present but a stub next to the Vulgate's (Genesis 1:1 = "x") is a
+	// warning, never an error -- the count-based checks can't see it.
+	if r := CheckCorpus("stub"); !hasWarning(r.Warnings, "suspiciously short") {
+		t.Fatalf("stub verse not warned; warnings: %v", r.Warnings)
+	}
+}
+
+func hasWarning(ws []string, substr string) bool {
+	for _, w := range ws {
+		if strings.Contains(w, substr) {
+			return true
+		}
+	}
+	return false
 }