chore(autoresearch): log iter 6, distinguish compile-level from assertion-level proof

.auto/prove_fix.sh

@@ -46,10 +46,12 @@ if [ "${RC}" -eq 0 ]; then
     echo "PROVE FAILED: tests still pass without the fix — this is not a real bug fix"
     exit 1
 fi
-if echo "${OUT}" | grep -qE '^(FAIL|--- FAIL)'; then
+if echo "${OUT}" | grep -q 'build failed'; then
+    KIND="compile (signature changed; behaviour proven by inspection)"
+elif echo "${OUT}" | grep -qE '^--- FAIL'; then
     KIND="assertion"
 else
-    KIND="compile"
+    KIND="failure"
 fi
 echo "PROVED: test fails without the fix (${KIND})"
 exit 0

.auto/results.tsv

@@ -5,3 +5,4 @@ iteration	commit	metric	delta	status	guard	description
 3	686e3ef	93	-2.0	keep	pass	filesrv.AbortUploadRecordError dedups error mapping + errors.As (2 sites, drops dead ErrInvalidUploadID)
 4	7e6b9e7	93	0.0	keep	pass	PROVEN FIX: singleflight image generation no longer dies with the first caller canceled ctx (test fails on revert)
 5	381c794	93	0.0	keep	pass	CORDIS: gate widened to catch bare "go call()" + 4 unprotected cleanup goroutines moved to util.Go (arch violations 4->0)
+6	ce33997	92	-1.0	keep	pass	BUGFIX admin logs: negative cursor was accepted (bool ignored by callers) -> error-only contract; proven via revert (compile-level) + contract test