Add six highest-priority agentic patterns

[arst]

Summary

• add Reversible Action Compensation, Progressive Agent Rollout, Synthetic User Simulation, Computer Use, Authenticated Delegation, and Self-Healing Operations Loop samples
• keep authority, budgets, rollout gates, compensation, and verification in deterministic host code with focused regression tests
• register all six projects in the solution, Pattern Explorer, and README catalog

Verification

• dotnet build Agentic Patterns.slnx --configuration Release: 111 projects, 0 errors, 0 warnings
• dotnet test Agentic Patterns.slnx --configuration Release --no-build: 463 tests passed, 0 warnings
• ran the compensation, rollout, and authenticated-delegation demos locally without credentials