Add CI probe — run only the 3 failing tests in isolation

UDF-augmented PDO churn (raw open/close 0..500 with 44 UDFs each)
also doesn't reproduce either bug. The triggering state must be
something the actual driver does in earlier tests.

Run a filtered PHPUnit invocation that exercises *only* the three
failing tests (no preceding suite). If they pass alone, the bug is
absolutely from prior tests' state buildup; if they fail alone,
it's intrinsic to the test setup. Either result narrows the search.

Author: JanJakes

.github/workflows/phpunit-tests-turso.yml

@@ -1995,6 +1995,22 @@ jobs:
           #     form crashes testReconstructTable. Test stays failing.
           PY
 
+      - name: Probe — run only the 3 failing tests via PHPUnit filter
+        continue-on-error: true
+        env:
+          LD_PRELOAD: ${{ steps.preload.outputs.value }}
+        working-directory: packages/mysql-on-sqlite
+        run: |
+          set +e
+          # If only the 3 failing tests are run (no preceding suite), do
+          # they still fail? This isolates whether the bug is intrinsic
+          # to the tests or accumulated from prior tests.
+          timeout --kill-after=10 120 \
+              php ./vendor/bin/phpunit -c ./phpunit.xml.dist \
+                  --filter '(testCreateTemporaryTable|testTemporaryTableHasPriorityOverStandardTable|testInformationSchemaTablesFilterByAutoIncrement)' \
+                  --debug 2>&1 | tail -50
+          echo "(probe step: continue-on-error)"
+
       - name: Run PHPUnit tests against Turso DB
         env:
           LD_PRELOAD: ${{ steps.preload.outputs.value }}