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.

frontend/tests/stk_params.test.js

@@ -147,6 +147,10 @@ test('composeRamInstallParams composes C9 + EF (C7/C8) like the vendor scripts',
 	// extra raw TLVs follow the generated prefix
 	assert.strictEqual(composeRamInstallParams('', '', '', 'CB02AABB', '').install_params,
 		'C900CB02AABB');
+	// a C9 above 255 bytes uses the 2-byte BER length (0x12C = 300)
+	const longC9 = 'AA'.repeat(300);
+	assert.strictEqual(composeRamInstallParams(longC9, '', '', '', '').install_params,
+		'C982012C' + longC9);
 });
 
 test('an EF-form STK part takes the quotas into its own EF (one EF, TS 102 226 8.2.1.3.2.1)', () => {