feat: add remote trust and server identity pinning

- Add SSH-style server identity keys and known-host verification for remote serve endpoints.
- Add remote add/list/remove commands for explicit endpoint persistence.
- Fix remote clients listing to fan out through target discovery instead of ambiguous auto-routing.
- Add URL glob matching for tabs filter and count with extension tests.
- Add n8n credential pinning for server public keys or SHA256 fingerprints.
- Remove obsolete compat shim behavior while keeping empty compat seams for future protocol changes.
- Bump browser-cli to 0.16.4 and n8n node to 0.3.1.
- Cover known-hosts, remote registry, compat seams, n8n protocol verification, and URL matching with tests.

n8n-nodes-browser-cli/test/protocol.test.ts

@@ -11,7 +11,10 @@ import {
   pqDecrypt,
   pqEncrypt,
   pqTransportKey,
+  serverFingerprint,
   signAuth,
+  verifyServerChallengeSignature,
+  verifyServerIdentity,
 } from '../nodes/BrowserCli/protocol';
 
 // Known-answer vectors produced by the real Python implementation
@@ -49,6 +52,19 @@ const DECRYPT_ENV = {
   ciphertext: '7e4f75fa68098ea9a162dfd49af7824526186b77e9ac346b58f30d73df2bef88d5e6cd',
 };
 const DECRYPT_PLAIN = 'hello world payload';
+const SERVER_PUB_HEX = '982c13bda72ef7b2bf4a8cd9756e4f283faaf4a34f9dec8e6c65585b64d9a902';
+const SERVER_SIG =
+  'fa6897bb7f00f711ee8af151384eda736a503008f8b8e11b972cfea46a0366d5' +
+  '3127c2f1e9ba01e72805b267d023c552756645ae7d95fd00fa277ed20a43ee09';
+const SERVER_FP = 'SHA256:wsYDqD4OnF/Sfvr3RKvVCOW8ET802H2qHSvWfnQwQrs';
+const SERVER_CHALLENGE = {
+  type: 'challenge',
+  nonce: NONCE_HEX,
+  server_version: '0.16.4',
+  min_client_version: '0.9.0',
+  server_pubkey: SERVER_PUB_HEX,
+  server_sig: SERVER_SIG,
+};
 
 test('canonicalJson matches Python json.dumps(sort_keys, ensure_ascii)', () => {
   assert.equal(canonicalJson(MSG), CANON);
@@ -139,3 +155,26 @@ test('decodeResponse parses plain JSON and decrypts PQ envelopes', () => {
   const raw = Buffer.from(JSON.stringify({ encrypted: env }));
   assert.deepEqual(decodeResponse(raw, secret), { success: true, data: 1 });
 });
+
+test('server identity fingerprint and signature match Python challenge signing', () => {
+  assert.equal(serverFingerprint(SERVER_PUB_HEX), SERVER_FP);
+  assert.equal(verifyServerChallengeSignature(SERVER_CHALLENGE), true);
+  assert.equal(verifyServerChallengeSignature({ ...SERVER_CHALLENGE, nonce: '22'.repeat(32) }), false);
+});
+
+test('verifyServerIdentity accepts pinned pubkey or fingerprint', () => {
+  assert.doesNotThrow(() => verifyServerIdentity(SERVER_CHALLENGE, SERVER_PUB_HEX, 'browser-host.example:8765', false));
+  assert.doesNotThrow(() => verifyServerIdentity(SERVER_CHALLENGE, SERVER_FP, 'browser-host.example:8765', false));
+});
+
+test('verifyServerIdentity rejects unknown and changed identities', () => {
+  assert.throws(
+    () => verifyServerIdentity(SERVER_CHALLENGE, null, 'browser-host.example:8765', false),
+    /Unknown browser-cli server identity/,
+  );
+  assert.throws(
+    () => verifyServerIdentity(SERVER_CHALLENGE, '00'.repeat(32), 'browser-host.example:8765', false),
+    /REMOTE SERVER IDENTITY CHANGED/,
+  );
+  assert.doesNotThrow(() => verifyServerIdentity(SERVER_CHALLENGE, null, 'browser-host.example:8765', true));
+});