fix(skill): correct duplicate Option numbering in auth section

[Marshall-Sun]

What

Fix duplicate Option numbering in the authentication section of skills/agent-browser/SKILL.md.

The current file has two headings both labeled "Option 4":

• Line 85: "Option 4: Session name"
• Line 96: "Option 4: Auth vault"

This causes "Option 5: State file" to also be off-by-one.

Fix

Renumbered sequentially:

Before	After
Option 4: Session name	Option 4: Session name (unchanged)
Option 4: Auth vault	Option 5: Auth vault
Option 5: State file	Option 6: State file

Scope

Text-only, 3 lines changed. No logic or structural changes.

[vercel]

@Marshall-Sun is attempting to deploy a commit to the Vercel Labs Team on Vercel.

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[ctate]

Thank you @Marshall-Sun!

[Marshall-Sun]

@ctate Thanks for the merge!

While working on this fix I noticed a broader issue: SKILL.md is currently 700+ lines, which exceeds Anthropic's recommended 500-line limit for skill files. The main contributors to the length are:

1. Auth content duplication — three subsections under "Common Patterns" largely repeat what's already covered in "Handling Authentication" (~70 lines of overlap)
2. Essential Commands — the full command reference could be moved to references/commands.md, keeping only the top ~15 commands inline (~60 lines saved)

Would you be open to a follow-up PR from me that trims the file down to ~450 lines via deduplication and offloading reference content to the existing references/ directory?