v3.22.0 (review fixes): the quota zero, the suite repair paths, the docs

Second review round on the unpushed v3.20.0-v3.22.0 batch:

- install parameters: a zero memory quota (nv_quota: 0 - the vendor
  reference form's C7 02 0000 C8 02 0000) is composed instead of being
  dropped as "unset" (only None/blank leaves the TLV out); a truncated EF
  length in stk_params is refused instead of read as an empty EF.
- test suites: a suite whose member script is gone is repairable - the
  update endpoint accepts pruning a dangling reference (a removal of a
  live script stays refused; the PWA's row Delete prunes it), and
  reconcile_scripts_to_suites() lists an orphan even when its suite_id
  write is refused by the validator, so a stored script that no longer
  validates stays visible in the editor and fails at run start with the
  message instead of disappearing.
- engine/PWA: the proactive action refuses a check.data (its result data
  is the drained-command list - the check was silently ignored); the
  vestigial _testScriptDraft is gone; berLenStr emits the 2/3-byte BER
  long form (a >255-byte C9 composes correctly).
- docs: api.md (the stop cleanup answers ok, never an automatic cancel;
  the server persists the counters - the PWA does not write them back; the
  suite bundle import always merges the scripts; the quota-0 note) and
  test-scripts.md (the event action covers all modelled events; the
  direct-create path needs a suite_id; the format history); help EN/RU
  counter wording.
- tests: the zero quota / truncated EF, the prune path, the invalid-script
  listing, the proactive data-check refusal, berLenStr and the >255-byte
  C9.  Tests: 839 frontend + 804 Python; sw cache simple-v403.

pysim_simple_server/testscript.py

@@ -398,6 +398,13 @@ def _normalise_check(check, kind, params):
         else:
             sw = {'mode': 'exact', 'value': '9000'}
     data = _check_spec(check.get('data'), 'check.data')
+    if kind == 'proactive' and data is not None:
+        # The proactive cleanup's result data is the drained command list, not
+        # a single response: a `data` check would be silently ignored, so it
+        # is refused here (assert the drained commands with `require`).
+        raise ScriptError('check.data is not used by the proactive action - '
+                          'assert what was drained with require, or the final '
+                          'status word with check.sw')
     por = check.get('por')
     if isinstance(por, dict):
         # The decoded-PoR assertion (available on scp80 actions whether the