fix(judge): relocate browser screenshots into screenshots_dir

[jacsamell]

What

@playwright/mcp writes browser_take_screenshot files relative to its cwd (the worktree run_dir), not --output-dir (only snapshots honour output-dir). So a judge's PNG landed in the worktree root while its decision file — and the posted review's 📸 Screenshots block — referenced screenshots_dir/<name>.png, which didn't resolve.

Fix

run_judge snapshots the pre-existing top-level PNGs and, after the stream completes, moves only the ones this run created into screenshots_dir (never touching committed assets). Posted screenshot paths now point at real files.

Verified live

judge_4 logged into the app via a storage_state session, navigated /assistants, opened the Add Function Tool modal, and captured a real authenticated screenshot — the last gap was the file landing in the worktree root instead of screenshots_dir.

🤖 Generated with Claude Code

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: b9d3bd49-f5bc-4af4-a8b5-68903b751d0d

📥 Commits

Reviewing files that changed from the base of the PR and between 4d56228 and 9fa1314.

📒 Files selected for processing (1)

• python/cube/automation/judge_panel.py

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