Update fast-agent to 0.6.16

- fast-agent: 0.6.15 -> 0.6.16

Author: acp-release[bot]

fast-agent/agent.json

@@ -1,7 +1,7 @@
 {
   "id": "fast-agent",
   "name": "fast-agent",
-  "version": "0.6.15",
+  "version": "0.6.16",
   "description": "Code and build agents with comprehensive multi-provider support",
   "repository": "https://github.com/evalstate/fast-agent",
   "website": "https://fast-agent.ai",
@@ -11,7 +11,7 @@
   "license": "Apache 2.0",
   "distribution": {
     "uvx": {
-      "package": "fast-agent-acp==0.6.15",
+      "package": "fast-agent-acp==0.6.16",
       "args": [
         "-x"
       ]