v3.22.0 (review fixes): the ownership reconciliation and the import guards

The suite/script ownership invariant could break silently: a suites import
with mode "replace" wiped the suites while their scripts stayed behind
(suite_id pointing at gone suites - invisible in the UI), a scripts import
with mode "replace" left every suite's member list dangling, and a script
whose suite_id disagreed with its listing suite stayed inconsistent.

- server: reconcile_scripts_to_suites() repairs the invariant - a script a
  suite lists adopts that suite (the member list is authoritative), a script
  no suite lists joins "Imported scripts"; migrate_scripts_to_suites()
  delegates to it (the startup migration is the same pass) and the suites
  import runs it after loading, so a "replace" adopts the wiped suites'
  scripts instead of losing them.
- the scripts import refuses mode "replace" while any suite still lists
  scripts (400 naming the dangling references; merge is the normal path).
- nits from the review: a legacy numeric `event` is no longer parsed as hex
  in the step summary/error check (0x0A displayed as 0x10), and an integral
  float memory quota (a JSON client's 200.0) is accepted.
- tests: the reconciliation (missing suite, listed-but-mismatched,
  idempotent), the scripts-replace guard (refused/allowed), the
  suites-replace adoption, the float quota, the numeric-event summary.
  Tests: 838 frontend + 800 Python; sw cache simple-v402.

tests/test_test_suites.py

@@ -222,6 +222,33 @@ class MigrationTests(unittest.TestCase):
             # idempotent: nothing left to attach
             self.assertEqual(srv.migrate_scripts_to_suites(scripts, suites), 0)
 
+    def test_the_reconciliation_adopts_listed_and_missing_suite_scripts(self):
+        # The general invariant repair: a script whose suite_id points at a
+        # missing suite (a suites import with mode replace) joins "Imported
+        # scripts"; a script a suite lists but whose suite_id is empty or
+        # wrong adopts the listing suite (the member list is authoritative).
+        from pysim_simple_server import server as srv
+        from pysim_simple_server import test_scripts
+        with tempfile.TemporaryDirectory() as tmp:
+            scripts = test_scripts.TestScriptStore(pathlib.Path(tmp) / 's.json')
+            suites = test_suites.TestSuiteStore(pathlib.Path(tmp) / 'u.json')
+            step = {'type': 'action', 'kind': 'status', 'params': {'attempts': 1}}
+            suite_a = suites.add({'name': 'A'})
+            gone = 'f' * 32
+            lost = scripts.add({'name': 'lost', 'suite_id': gone, 'steps': [step]})
+            listed = scripts.add({'name': 'listed', 'steps': [step]})
+            suites.update(suite_a['id'], {'scripts': [
+                {'script_id': listed['id'], 'role': 'setup', 'on_fail': 'stop'}]})
+            self.assertEqual(srv.reconcile_scripts_to_suites(scripts, suites), 2)
+            # the listing suite wins (its role is kept)
+            self.assertEqual(scripts.get(listed['id'])['suite_id'], suite_a['id'])
+            # the lost one is adopted by "Imported scripts"
+            imported = suites.find_by_name('Imported scripts')
+            self.assertEqual(scripts.get(lost['id'])['suite_id'], imported['id'])
+            self.assertEqual([e['script_id'] for e in imported['scripts']], [lost['id']])
+            # idempotent
+            self.assertEqual(srv.reconcile_scripts_to_suites(scripts, suites), 0)
+
 
 if __name__ == '__main__':
     unittest.main()