docs: remove Japanese edge notation

[Kilerd]

Summary

• remove unsupported Japanese edge notation from the Fine-grained Control overview
• remove J/L and boundary-mode examples from the Japanese phoneme-control guide
• keep Japanese docs focused on pitch-accent digit notation

Verification

• ./node_modules/.bin/prettier --check developer-guide/core-features/fine-grained-control.mdx developer-guide/core-features/fine-grained-control/japanese.mdx
• git diff --check HEAD~1..HEAD

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 92db915f-67e4-4849-b06b-0f880f475597

📥 Commits

Reviewing files that changed from the base of the PR and between be7651b and f4cdd5a.

📒 Files selected for processing (2)

• developer-guide/core-features/fine-grained-control.mdx
• developer-guide/core-features/fine-grained-control/japanese.mdx

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/remove-japanese-edge-notation

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