[Bug]: Report file written without explicit charset

[Splatcrafter]

AI REVIEWED

Module: cli
File: cli/command/MigrateCommand.java (~line 484)
Severity: Low

Summary

Files.writeString(this.reportFile.toPath(), reportContent); // platform default charset

Same issue as #195 but specific to the report file output.

Suggested Fix

Files.writeString(this.reportFile.toPath(), reportContent, StandardCharsets.UTF_8);