Revert "feat: add Trinity model system prompt support" (#12029)

Author: rekram1-node

packages/opencode/src/session/prompt/trinity.txt

@@ -8,7 +8,6 @@ import PROMPT_BEAST from "./prompt/beast.txt"
 import PROMPT_GEMINI from "./prompt/gemini.txt"
 
 import PROMPT_CODEX from "./prompt/codex_header.txt"
-import PROMPT_TRINITY from "./prompt/trinity.txt"
 import type { Provider } from "@/provider/provider"
 
 export namespace SystemPrompt {
@@ -22,7 +21,6 @@ export namespace SystemPrompt {
       return [PROMPT_BEAST]
     if (model.api.id.includes("gemini-")) return [PROMPT_GEMINI]
     if (model.api.id.includes("claude")) return [PROMPT_ANTHROPIC]
-    if (model.api.id.toLowerCase().includes("trinity")) return [PROMPT_TRINITY]
     return [PROMPT_ANTHROPIC_WITHOUT_TODO]
   }