docs: add stable/next branch-lane guidance for agents

[kilbot]

Adds a Branch lanes section so agents know electron has two permanent trunks (main stable, next in-dev) and to ask which lane when ambiguous. Part of the dual-lane rollout.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Repository: wcpos/coderabbit/.coderabbit.yaml

Review profile: CHILL

Plan: Pro Plus

Run ID: 41cadd91-e17c-45e5-8bb8-7b670f9d5c39

📥 Commits

Reviewing files that changed from the base of the PR and between 5851f72 and 240f1cf.

📒 Files selected for processing (1)

• AGENTS.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/branch-lanes

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