open --json does not return .page despite llm-txt contract

[AlexBlack772]

Issue Type

Both / Not sure

Operating System

macOS

Description of the bug

Summary

According to cmd/llm_txt.md, agents should capture a page id from:

browseros-cli open --json <url> | jq -r .page

However, open --json currently returns only url, without page.

### Steps to reproduce

browseros-cli open --json https://example.org

### Actual result

{"url":"https://example.org"}

### Expected result

The JSON response should include a numeric page field, for example:

{"page":123,"url":"https://example.org"}

### Why this matters

The documented agent workflow depends on .page:

page=$(browseros-cli open --json https://example.com | jq -r .page)
browseros-cli -p "$page" snapshot

Without .page, follow-up page-scoped commands cannot be used reliably.

### Steps to Reproduce

run 

browseros-cli open --json https://example.org

### Screenshots / Videos

_No response_

### BrowserOS Version

_No response_

### Additional Context

_No response_