Sync Japanese README

Synchronize README_ja.md files with their English README.md counterparts, producing natural, native-speaker-quality Japanese — not literal translation.

Usage

• /sync-ja — Auto-detect all out-of-sync README_ja.md files and update them
• /sync-ja 09_browser_use — Sync a specific module's README_ja.md
• /sync-ja 06_identity 07_gateway — Sync multiple specific modules
• /sync-ja --check — Report which files are out of sync without modifying them

Arguments

$ARGUMENTS contains optional module directory names and flags.

Parse $ARGUMENTS for:

• Positional: directory name(s) (optional, e.g. 09_browser_use)
• --check: Dry-run mode — only report drift, don't edit