refactor(providers): consume @agentic-kit/protocol kernel

Point the openai, anthropic, and ollama adapters at @agentic-kit/protocol
instead of re-declaring the kernel locally, removing ~900 lines of
byte-identical and drifting copies. Each adapter now depends only on the
zero-dep kernel, so it stays independently installable, and all three
share the canonical Context.tools, ToolCallContent.rawArguments/decision,
and full StreamOptions.

Author: yyyyaaa

packages/anthropic/__tests__/tsconfig.json

@@ -7,7 +7,8 @@
     "paths": {
       "@test/*": ["tools/test/*"],
       "agentic-kit": ["packages/agentic-kit/src"],
-      "@agentic-kit/agent": ["packages/agent/src"]
+      "@agentic-kit/agent": ["packages/agent/src"],
+      "@agentic-kit/protocol": ["packages/protocol/src"]
     },
     "types": ["jest", "node"]
   },

packages/anthropic/package.json

@@ -36,5 +36,8 @@
     "test": "jest",
     "test:watch": "jest --watch"
   },
+  "dependencies": {
+    "@agentic-kit/protocol": "workspace:*"
+  },
   "keywords": []
 }