The installer hardcoded `opencode.json` in all OpenCode config paths, creating a duplicate file when users already had `opencode.jsonc`. Add `resolveOpencodeConfigPath()` helper that prefers `.jsonc` when it exists, and use it in all three OpenCode config touchpoints: attribution check, permission configuration, and uninstall cleanup. Closes #1053 Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>