feat: upgrade claude-agent-sdk to 0.2.38 and adapt to new SDK types (#113)

* feat: upgrade claude-agent-sdk to 0.2.38 and adapt to new SDK types

- Bump @anthropic-ai/claude-agent-sdk from 0.1.x to 0.2.38 (both root and mcp-server)
- Bump zod from 3.x to 4.x (SDK peer dependency)
- Add allowDangerouslySkipPermissions to query options (required for bypassPermissions)
- Suppress new SDK message types (tool_progress, tool_use_summary, auth_status)
- Use structured error field on assistant messages instead of text-sniffing
- Add stop_reason to result message handling for diagnostics
- Add SDKAssistantMessageError type matching SDK's string literal union

* chore: remove CLAUDE_CODE_MAX_OUTPUT_TOKENS from all config and docs

mcp-server/package.json

@@ -8,8 +8,8 @@
     "clean": "rm -rf dist"
   },
   "dependencies": {
-    "@anthropic-ai/claude-agent-sdk": "^0.1.0",
-    "zod": "^3.22.4"
+    "@anthropic-ai/claude-agent-sdk": "^0.2.38",
+    "zod": "^4.3.6"
   },
   "devDependencies": {
     "@types/node": "^25.0.3",