feat: one keyset per key version - indexed keys and counters (v3.8.0)

A card usually holds several OTA key sets, and the SCP80 counter is tracked
per key version on the card, so a preset now carries one keyset per
GlobalPlatform key version - the b8..b5 nibble of KIc/KID (TS 102 225
5.1.2/A.2), the version is implicit in the bytes.  The spec is explicit:
"a dedicated counter shall be associated to each key version" (Annex A.1) and
"the key version number indicated in the KIc and KID (bits b8..b5) fields
shall be identical when different from 0" - a mismatch is rejected by the card
with "Unidentified security error" (A.2).

Server (presets.py, schema 2):
- a preset carries `keysets: [{kic, kid, kicKey, kidKey, cntr}]`; validation
  refuses a KIc/KID version mismatch (A.2), a version outside 01-0F ('00'
  means "no security" and is a packet-level choice, not a keyset), duplicate
  versions and missing keys/counters; a v3.8.0 flat preset converts into one
  keyset on load and on import;
- `set_counter(..., kvn)` writes the counter of that keyset (monotonic per
  keyset), the audit line carries the kvn, and `find_keyset()` serves the
  lookups;
- the operations derive the key version from the request's KIc byte and
  persist into that keyset: /api/send-ota, the RAM install/install-app/compat
  steps (_ram_send_gp_apdu) and the test runner's SCP80 steps (which may name
  a `kvn` per step and keep one working counter per keyset);
- a non-zero key version the named preset does not define, or a KIc/KID
  mismatch, is refused before anything is built (_preset_keyset_check /
  _keyset_guard: 400, or a step error in the test runner).  Without a
  preset_id only the mismatch rule applies.

PWA:
- the Cards form's KIc/KID/counter/keys inputs become a keyset editor (one row
  per version: KIc, KID, both keys, that version's counter, Add/Remove; the
  version is shown derived from the bytes and a mismatch is flagged);
- the SCP80 and RAM views get a Key-version selector beside the preset
  selector, driving the KIc/KID bytes and loading that keyset's keys and
  counter; the packet builder refuses a version the preset does not define
  (spKeysetCheck/spKeysetGuard, pure and unit-tested);
- the counter syncs are per keyset (spCntrLocalSync/ramSaveCntr), the SCP80
  form's counter edit posts the keysets, and the test-run write-back syncs
  every counter the server reports (scp80_counters).

Docs/help/AGENTS updated; sw cache simple-v335.  Tests: 610 Python (store
keysets, endpoint refusals, the counter landing in the right keyset) and 726
Node (keysets.test.js plus the updated harnesses).

frontend/tests/cards_counter.test.js

@@ -23,10 +23,22 @@ function extractFunc(src, name) {
 
 let code = '';
 for (const fn of ['cardsTarValue', 'cardsApplyFields', 'cardsApply',
-	'spRefreshFromPreset', 'spPorAccepted', 'spNextCntr']) {
+	'spRefreshFromPreset', 'spPorAccepted', 'spNextCntr', 'spPresetIdx',
+	'spKeysetKvnOf', 'spKeysetList', 'spKeysetFor', 'spKeysetCheck',
+	'spKeysetOptionsHtml', 'cardsKeysetRowHtml', 'cardsKeysetRowsRender',
+	'cardsKeysetAdd', 'cardsKeysetRemove', 'cardsKeysetKvnUpdate',
+	'cardsKeysetsFromForm', 'spKeysetSync', 'spKeysetApply',
+	'spKeysetChanged', 'ramKeysetChanged', 'ramPresetIdx', 'spKeysetGuard',
+	'ramKeysetGuard',
+]) {
 	code += extractFunc(html, fn) + '\n';
 }
+code = 'var _cardsKeysetCount = 0;\n' + code;
+code = 'var _genSpBuildStub = function() {};\n' + code;
 eval(code);
+globalThis._genSpBuild = () => {};
+globalThis.spShowSizeInfo = () => {};
+globalThis.spKeysetSync = globalThis.spKeysetSync || (() => {});
 
 // The SP form is a working copy: the preset is the source of truth, and
 // every SCP80/RAM operation re-reads it before starting (v3.6.3).  The plain
@@ -49,6 +61,9 @@ function fakeEnv(selValue, selId, presetCntr) {
 	globalThis.updateSp = () => {};
 	let gen = 0;
 	globalThis.genSp = () => { gen++; };
+	// cardsApply refreshes the preview directly (the guarded genSp() is the
+	// Generate button's path), so the counter stub is _genSpBuild
+	globalThis._genSpBuild = () => { gen++; };
 	return { els, gen: () => gen };
 }