feat(opencode): Add output channel logging and minimal variant

src/opencodeService.ts

@@ -1,6 +1,7 @@
 import { exec, spawn, ExecException } from "child_process";
 import * as vscode from "vscode";
 import { getGitDiff, getRepositoryRoot } from "./gitService";
+import { output } from "./extension";
 
 export interface GenerateOptions {
     model?: string;
@@ -53,8 +54,17 @@ ${diff}
 
 Generate a concise Conventional Commit message for these changes:`;
 
+    const log = `[${Date.now()}]\r\n${prompt}`;
+    output.appendLine(log);
+
     return new Promise((resolve, reject) => {
-        const args: string[] = ["run", "--format", "default"];
+        const args: string[] = [
+            "run",
+            "--format",
+            "default",
+            "--variant",
+            "minimal",
+        ];
 
         if (model) {
             args.push("--model", model);