test: add complex visual workflow campaign

[abrichr]

Summary

Adds a reusable complex visual workflow campaign that combines pixel-only multi-window interaction with email, CSV/spreadsheet, document handling, branches, loops, and independent effect verification.

Campaign

• 27 trials across healthy and fault conditions
• 12 expected VERIFIED outcomes
• 15 expected safe halts
• wrong entity, ambiguity, focus theft, stale frame, partial render, display drift, reconnect, and commit-timeout
• 0 silent incorrect successes
• 0 over-halts
• 0 model calls

The public change contains the general harness and synthetic fixture only. It does not publish tuned thresholds, grown failure data, or customer recipes.

Verification

• focused Pytest campaign tests
• direct 27-trial campaign
• Ruff
• source-boundary validation