test: add real-RDP multi-window vision campaign

[abrichr]

What changed

• add a deterministic real-RDP fixture with Inbox, Worklist, and Scheduler task windows
• record, compile, and replay a 22-action pixel-only workflow with scrolling and window switching
• verify the business result through independent SQLite, CSV, and Maildir reads
• run three trials each for healthy, row-reordered, wrong-record, and focus-theft conditions
• define the remaining duplicate-control, partial-render, display-drift, and uncertain-write campaign
• add a path-scoped, cancelable CI job so the expensive test does not run for unrelated changes

Why

The existing complex email and spreadsheet benchmarks use API actuation. The existing real-RDP benchmark uses one simple application. This change starts the missing integrated campaign for realistic visual automation across several task windows.

Validation

• ruff check passed for the new Python files
• campaign contract test passed
• real-RDP test wrapper skipped locally because Docker status calls are blocked by another stuck Docker workload
• the PR CI job runs the exact real-RDP subset and must pass before this draft is ready

Scope

The fixture is synthetic and pixel-only. It does not claim application-specific Windows or Citrix qualification. The result marks the full campaign incomplete until the remaining conditions run.