phase29ab(p7): add pattern6 reverse+matchscan negative smokes

apps/tests/phase29ab_pattern6_matchscan_firstfail_min.hako

@@ -0,0 +1,18 @@
+// Phase 29ab P7: Pattern6 match scan first-fail (missing step)
+// Expect: JoinIR freeze (missing step update)
+
+static box Main {
+    find_missing_step(s, ch) {
+        local i = 0
+        loop(i < s.length()) {
+            if s.substring(i, i + 1) == ch {
+                return i
+            }
+        }
+        return -1
+    }
+
+    main() {
+        return Main.find_missing_step("abc", "b")
+    }
+}

apps/tests/phase29ab_pattern6_reverse_firstfail_min.hako

@@ -0,0 +1,19 @@
+// Phase 29ab P7: Pattern6 reverse scan first-fail (step contract violation)
+// Expect: JoinIR freeze (reverse step must be i = i - 1)
+
+static box Main {
+    last_index_bad_step(s, ch) {
+        local i = s.length() - 1
+        loop(i >= 0) {
+            if s.substring(i, i + 1) == ch {
+                return i
+            }
+            i = i + 1
+        }
+        return -1
+    }
+
+    main() {
+        return Main.last_index_bad_step("abc", "b")
+    }
+}

tools/smokes/v2/profiles/integration/apps/phase29ab_pattern6_matchscan_firstfail_min_vm.sh

@@ -0,0 +1,40 @@
+#!/bin/bash
+# Phase 29ab P7: Pattern6 match scan first-fail (contract violation)
+# Tests: missing step update must fail-fast
+
+source "$(dirname "$0")/../../../lib/test_runner.sh"
+export SMOKES_USE_PYVM=0
+require_env || exit 2
+
+INPUT="$NYASH_ROOT/apps/tests/phase29ab_pattern6_matchscan_firstfail_min.hako"
+RUN_TIMEOUT_SECS=${RUN_TIMEOUT_SECS:-10}
+
+set +e
+OUTPUT=$(timeout "$RUN_TIMEOUT_SECS" env NYASH_DISABLE_PLUGINS=1 HAKO_JOINIR_STRICT=1 "$NYASH_BIN" "$INPUT" 2>&1)
+EXIT_CODE=$?
+set -e
+
+if [ "$EXIT_CODE" -eq 124 ]; then
+    test_fail "phase29ab_pattern6_matchscan_firstfail_min_vm: hakorune timed out (>${RUN_TIMEOUT_SECS}s)"
+    exit 1
+fi
+
+if [ "$EXIT_CODE" -eq 0 ]; then
+    echo "[FAIL] Expected JoinIR contract freeze error, got exit 0"
+    echo "[INFO] Output:"
+    echo "$OUTPUT" | tail -n 40 || true
+    test_fail "phase29ab_pattern6_matchscan_firstfail_min_vm: Unexpected success"
+    exit 1
+fi
+
+if echo "$OUTPUT" | grep -q "\[joinir/phase29ab/pattern6/contract\]"; then
+    test_pass "phase29ab_pattern6_matchscan_firstfail_min_vm: joinir contract freeze detected"
+    exit 0
+else
+    echo "[FAIL] Expected joinir contract freeze tag in output"
+    echo "[INFO] Exit code: $EXIT_CODE"
+    echo "[INFO] Output:"
+    echo "$OUTPUT" | tail -n 60 || true
+    test_fail "phase29ab_pattern6_matchscan_firstfail_min_vm: Missing joinir contract freeze tag"
+    exit 1
+fi

tools/smokes/v2/profiles/integration/apps/phase29ab_pattern6_reverse_firstfail_min_vm.sh

@@ -0,0 +1,40 @@
+#!/bin/bash
+# Phase 29ab P7: Pattern6 reverse scan first-fail (contract violation)
+# Tests: reverse scan step mismatch must fail-fast
+
+source "$(dirname "$0")/../../../lib/test_runner.sh"
+export SMOKES_USE_PYVM=0
+require_env || exit 2
+
+INPUT="$NYASH_ROOT/apps/tests/phase29ab_pattern6_reverse_firstfail_min.hako"
+RUN_TIMEOUT_SECS=${RUN_TIMEOUT_SECS:-10}
+
+set +e
+OUTPUT=$(timeout "$RUN_TIMEOUT_SECS" env NYASH_DISABLE_PLUGINS=1 HAKO_JOINIR_STRICT=1 "$NYASH_BIN" "$INPUT" 2>&1)
+EXIT_CODE=$?
+set -e
+
+if [ "$EXIT_CODE" -eq 124 ]; then
+    test_fail "phase29ab_pattern6_reverse_firstfail_min_vm: hakorune timed out (>${RUN_TIMEOUT_SECS}s)"
+    exit 1
+fi
+
+if [ "$EXIT_CODE" -eq 0 ]; then
+    echo "[FAIL] Expected JoinIR contract freeze error, got exit 0"
+    echo "[INFO] Output:"
+    echo "$OUTPUT" | tail -n 40 || true
+    test_fail "phase29ab_pattern6_reverse_firstfail_min_vm: Unexpected success"
+    exit 1
+fi
+
+if echo "$OUTPUT" | grep -q "\[joinir/phase29ab/pattern6/contract\]"; then
+    test_pass "phase29ab_pattern6_reverse_firstfail_min_vm: joinir contract freeze detected"
+    exit 0
+else
+    echo "[FAIL] Expected joinir contract freeze tag in output"
+    echo "[INFO] Exit code: $EXIT_CODE"
+    echo "[INFO] Output:"
+    echo "$OUTPUT" | tail -n 60 || true
+    test_fail "phase29ab_pattern6_reverse_firstfail_min_vm: Missing joinir contract freeze tag"
+    exit 1
+fi