feat(acp): add experimental ACP support

Co-authored-by: Jonathan Taylor <visionik@pobox.com>

pnpm-lock.yaml

@@ -13,6 +13,9 @@ importers:
 
   .:
     dependencies:
+      '@agentclientprotocol/sdk':
+        specifier: 0.13.0
+        version: 0.13.0(zod@4.3.5)
       '@buape/carbon':
         specifier: 0.0.0-beta-20260110172854
         version: 0.0.0-beta-20260110172854(hono@4.11.4)
@@ -357,6 +360,11 @@ importers:
 
 packages:
 
+  '@agentclientprotocol/sdk@0.13.0':
+    resolution: {integrity: sha512-Z6/Fp4cXLbYdMXr5AK752JM5qG2VKb6ShM0Ql6FimBSckMmLyK54OA20UhPYoH4C37FSFwUTARuwQOwQUToYrw==}
+    peerDependencies:
+      zod: ^3.25.0 || ^4.0.0
+
   '@anthropic-ai/sdk@0.71.2':
     resolution: {integrity: sha512-TGNDEUuEstk/DKu0/TflXAEt+p+p/WhTlFzEnoosvbaDU2LTjm42igSdlL0VijrKpWejtOKxX0b8A7uc+XiSAQ==}
     hasBin: true
@@ -4581,6 +4589,10 @@ packages:
 
 snapshots:
 
+  '@agentclientprotocol/sdk@0.13.0(zod@4.3.5)':
+    dependencies:
+      zod: 4.3.5
+
   '@anthropic-ai/sdk@0.71.2(zod@4.3.5)':
     dependencies:
       json-schema-to-ts: 3.1.1