feat(shared): add file-based logger utility

src/shared/index.ts

@@ -2,3 +2,4 @@ export * from "./frontmatter"
 export * from "./command-executor"
 export * from "./file-reference-resolver"
 export * from "./model-sanitizer"
+export * from "./logger"

src/shared/logger.ts

@@ -0,0 +1,20 @@
+// Shared logging utility for the plugin
+
+import * as fs from "fs"
+import * as os from "os"
+import * as path from "path"
+
+const logFile = path.join(os.tmpdir(), "oh-my-opencode.log")
+
+export function log(message: string, data?: unknown): void {
+  try {
+    const timestamp = new Date().toISOString()
+    const logEntry = `[${timestamp}] ${message} ${data ? JSON.stringify(data) : ""}\n`
+    fs.appendFileSync(logFile, logEntry)
+  } catch {
+  }
+}
+
+export function getLogFilePath(): string {
+  return logFile
+}