v3.26.0: per-TAR default keysets (the preset/SCP80/RAM rework)

Every preset TAR entry carries `keyset` (int 1-15) - the keyset every
operation addressed to that TAR uses: mandatory for any non-zero MSL
(the counters are keyset-linked), optional for MSL 00 (allowed: some
cards reject the no-security 00/00 KIc/KID form).  The store fills it
automatically when the preset has a single keyset, the validation
refuses an entry naming an undefined keyset, and the schema is 6 (a v5
file loads leniently; editing it forces the fix).

The keyset selectors are gone: the SCP80 TAR field became a select of
the preset's entries (applying the TAR's keyset to the form and seeding
the SPI1 from its MSL); the RAM operations use the preset's ISD role
entry (the PWA sends only the preset id, the ISD TAR, SPI and the
counter override - the server resolves the keyset and the keys:
presets.tar_keyset, _preset_tar_keyset, _resolve_operation_keyset,
_op_keyset, used by send-ota's APDU path, ram-install, ram-install-app
and cap-compat); the counter probe and the test runner's scp80 steps
default to their TAR's keyset (an explicit kvn stays an override).  A
security TAR without a keyset refuses the operation ("set it in the
Cards tab") - never a silent keyless send - and the start buttons wait
for a usable operation-TAR keyset.

The TAR probe checks the preset's TAR list only (the standard
TAR_PROBE_TARS list and the custom-TAR localStorage are gone; a `tars`
list selects a subset, a TAR outside the preset is refused), each row
using its own MSL and default keyset.  The Cards editor's TAR table
gained a Keyset column (the only keyset preselected, an amber marker
when a security MSL lacks one).

Docs: help EN/RU, api.md's tar-probe contract, both AGENTS.  Tests: the
store (the field, the auto-fill, the schema, the string forms), the
server resolution (send-ota + the refusal, the probe's per-row keysets
and refusals), the PWA (the TAR select, the RAM ISD resolution, the
keyset-free requests) - several fixtures updated for the new schema.
891 frontend + 885 Python; sw cache simple-v434.

frontend/tests/ram_counter_flow.test.js

@@ -35,14 +35,20 @@ for (const fn of ['berLenStr', 'ramDeleteApdu', 'ramIncrementCntr', 'ramSaveCntr
 	'ramCntrLowBox', 'ramCntrLowClear',
 	'escHtml', 'esc',
 	'spKeysetKvnOf', 'spKeysetList', 'spKeysetFor', 'spKeysetCheck',
-	'spKeysetOptionsHtml', 'cardsKeysetRowHtml', 'cardsKeysetRowsRender',
+	'spTarOptionsHtml', 'spTarRender', 'spSpi1Seed', 'spTarKeysetGuard', 'cardsTarKeysetCell', 'cardsTarKeysetFromForm', 'cardsTarKeysetRefresh', 'cardsTarRowsRender', 'cardsTarRowHtml', 'cardsTarsFromTable', 'cardsFreeTarsFromForm', 'cardsRoleTar', 'cardsTarEntry', 'cardsTarList', 'cardsRoleDefault', 'cardsKeysetRowHtml', 'cardsKeysetRowsRender',
 	'cardsKeysetAdd', 'cardsKeysetRemove', 'cardsKeysetKvnUpdate',
-	'spKeysetChanged', 'ramKeysetChanged', 'ramPresetIdx', 'spKeysetGuard',
+	'ramPresetIdx', 'spKeysetGuard',
 	'ramKeysetGuard',
 ]) {
 	code += extractFunc(html, fn) + '\n';
 }
 code = 'var _cardsKeysetCount = 0;\n' + code;
+// the role defaults the TAR helpers read (v3.26.0)
+for (const c of ['CARDS_TAR_DEFAULTS', 'CARDS_TAR_ROLES', 'CARDS_MSL_DEFAULT']) {
+	const m = new RegExp('const\\s+' + c + '\\s*=\\s*([^;]+);').exec(html);
+	if (!m) throw new Error('const ' + c + ' not found');
+	code = 'var ' + c + ' = ' + m[1] + ';\n' + code;
+}
 eval(code);
 
 function fakeEnv(por, success) {