Add browser tab harvest and inspection support

[NathanSkene]

Summary

• add live ChatGPT tab inspection and attachment support for browser mode
• add session harvest/live tail commands and persisted browser harvest metadata
• update ChatGPT browser selectors/model detection for current composer and Pro UI

What changed

• Added --browser-tab <ref> to reuse an existing ChatGPT tab by current, target id, URL, or title substring.
• Added oracle status --browser-tabs to inspect live ChatGPT tabs, including model label, stop/send signals, session linkage, and last assistant snippet.
• Added oracle session <id> --harvest and oracle session <id> --live.
• Allowed oracle session <id> --write-output <path> to write harvested browser output.
• Added browser/session metadata to persist harvested output details.
• Updated ChatGPT browser DOM/model detection to recognize the current composer selectors and ChatGPT + Pro state.

Validation

• pnpm format:check
• pnpm lint
• pnpm build
• pnpm test

Live browser validation

Verified from the source-built CLI against a real remote Chrome session on 127.0.0.1:9222:

• status --browser-tabs lists live ChatGPT tabs
• --browser-tab current reuses an existing tab and returns the expected response
• session --harvest --write-output harvests browser output and writes it to disk
• session --live tails the browser-backed session
• --browser-tab "Oracle Browser Review" attaches by title substring without opening a new tab

Notes

• README change is formatter-only alignment.
• This PR is the source-repo version of the local browser reliability work already proven on the machine.