meta: use colors for agents (#5845)

.opencode/agent/docs.md

@@ -1,5 +1,6 @@
 ---
 description: ALWAYS use this when writing docs
+color: "#38A3EE"
 ---
 
 You are an expert technical documentation writer

.opencode/agent/triage.md

@@ -2,6 +2,7 @@
 mode: primary
 hidden: true
 model: opencode/claude-haiku-4-5
+color: "#44BA81"
 tools:
   "*": false
   "github-triage": true