feat(messaging-ui): KernelClientAdapter — direct-IIOS transport for the SDK

Implements MessagingAdapter over @insignia/iios-kernel-client (browser → IIOS,
token-in): listConversations/openThread/history/send/subscribe/typing/markRead
/react, mapping kernel Message/ThreadSummary/annotations onto the SDK's neutral
types. currentActorId comes from the host's session (senderId space), never
inferred from history — the exact bug the conformance suite kills.

- lives in adapters/ (transport boundary intact — core stays transport-free)
- ships from the ./adapters/kernel-client subpath (kernel-client is an optional
  peer dep; excluded from the main bundle)
- connectKernelAdapter({serviceUrl, token, currentUserId}) convenience
- passes the shared adapter conformance suite (12 tests) over the real
  MessageSocket facade with only the socket.io layer faked
- media/attachments deferred (kernel-client has no presign yet)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

pnpm-lock.yaml

@@ -328,6 +328,9 @@ importers:
 
   packages/iios-messaging-ui:
     devDependencies:
+      '@insignia/iios-kernel-client':
+        specifier: workspace:*
+        version: link:../iios-kernel-client
       '@testing-library/dom':
         specifier: ^10.4.0
         version: 10.4.1
@@ -520,6 +523,9 @@ packages:
     resolution: {integrity: sha512-/PZmyAlb2NGWPikRRuiWLdfHQd8Wrx6lX4HqvTcaDhlU43M3T0ud4PH2T3QDp7BzHYY92xtD8iPxX2asg67G1A==}
     engines: {node: ^18.19.1 || ^20.11.1 || >=22.0.0, npm: ^6.11.0 || ^7.5.6 || >=8.0.0, yarn: '>= 1.13.0'}
 
+  '@asamuzakjp/css-color@3.2.0':
+    resolution: {integrity: sha512-K1A6z8tS3XsmCMM86xoWdn7Fkdn9m6RSVtocUrJYIwZnFVkng/PvkEoWtOWmP+Scc6saYWHWZYbndEEXxl24jw==}
+
   '@aws-sdk/checksums@3.1000.18':
     resolution: {integrity: sha512-IImkbEyXdV6/uaF5r6Wkk+8718mQw1ll83j0a4a30R3JM/rHVFdWAiT4jtJpFjJiIwM/oJ6SxIxr0z2TaQUGqw==}
     engines: {node: '>=20.0.0'}
@@ -592,9 +598,6 @@ packages:
     resolution: {integrity: sha512-sl4Bm6yiMNYrZKkqqDFWN0UfnWhlS8ivKxrYl+6t0gCLrqr8y3B2IqZZbFRkfaVVp7C/baApyh71P+LeE1A2sQ==}
     engines: {node: '>=18.0.0'}
 
-  '@asamuzakjp/css-color@3.2.0':
-    resolution: {integrity: sha512-K1A6z8tS3XsmCMM86xoWdn7Fkdn9m6RSVtocUrJYIwZnFVkng/PvkEoWtOWmP+Scc6saYWHWZYbndEEXxl24jw==}
-
   '@babel/code-frame@7.29.7':
     resolution: {integrity: sha512-Aup7aUOfpbAUg2ROOJN6Iw5f9DMBlzu0mIkm/malLQFN/YQgO48wCj0Kxa3sEHJvPVFg7siR+qRInwXd2qhQKw==}
     engines: {node: '>=6.9.0'}
@@ -3677,6 +3680,14 @@ snapshots:
     transitivePeerDependencies:
       - chokidar
 
+  '@asamuzakjp/css-color@3.2.0':
+    dependencies:
+      '@csstools/css-calc': 2.1.4(@csstools/css-parser-algorithms@3.0.5(@csstools/css-tokenizer@3.0.4))(@csstools/css-tokenizer@3.0.4)
+      '@csstools/css-color-parser': 3.1.0(@csstools/css-parser-algorithms@3.0.5(@csstools/css-tokenizer@3.0.4))(@csstools/css-tokenizer@3.0.4)
+      '@csstools/css-parser-algorithms': 3.0.5(@csstools/css-tokenizer@3.0.4)
+      '@csstools/css-tokenizer': 3.0.4
+      lru-cache: 10.4.3
+
   '@aws-sdk/checksums@3.1000.18':
     dependencies:
       '@aws-sdk/core': 3.975.3
@@ -3842,14 +3853,6 @@ snapshots:
 
   '@aws/lambda-invoke-store@0.3.0': {}
 
-  '@asamuzakjp/css-color@3.2.0':
-    dependencies:
-      '@csstools/css-calc': 2.1.4(@csstools/css-parser-algorithms@3.0.5(@csstools/css-tokenizer@3.0.4))(@csstools/css-tokenizer@3.0.4)
-      '@csstools/css-color-parser': 3.1.0(@csstools/css-parser-algorithms@3.0.5(@csstools/css-tokenizer@3.0.4))(@csstools/css-tokenizer@3.0.4)
-      '@csstools/css-parser-algorithms': 3.0.5(@csstools/css-tokenizer@3.0.4)
-      '@csstools/css-tokenizer': 3.0.4
-      lru-cache: 10.4.3
-
   '@babel/code-frame@7.29.7':
     dependencies:
       '@babel/helper-validator-identifier': 7.29.7