feat(judge): load an authenticated session for browser review (storage_state)

[jacsamell]

What

Browser-judges on auth-gated apps only ever reached the login redirect — an unauthenticated headless browser has no session. This adds opt-in verify.dev_server.storage_state: a Playwright storageState file (cookies + localStorage) the judge's @playwright/mcp loads via --storage-state, so it reviews the app logged-in.

Changes

• DevServerConfig.storage_state + loader.
• _augment_playwright_args injects --storage-state (idempotent; operator args win).
• _populate_browser_context resolves the path (repo-root-relative or absolute) and fails closed: configured-but-missing → [BROWSER UNAVAILABLE] with an actionable reason (generate the session first) rather than wasting the pass on login pages. Unset → logged-out browsing as before (fine for public apps).

cube only consumes the file; generating it is out of band (reuse the app's e2e auth setup).

Tests

5 new (--storage-state inject / omit / idempotent). Automation + core suites green (499 passed).

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 57517754-1a62-459f-90a0-00f837503acc

📥 Commits

Reviewing files that changed from the base of the PR and between 835283f and ed955ab.

📒 Files selected for processing (4)

• python/cube/automation/judge_panel.py
• python/cube/core/dev_server.py
• python/cube/core/user_config.py
• tests/automation/test_judge_panel_browser_gating.py

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