feat: end-to-end validation matrix for all load testing tools

[kristopherjturner]

Overview

Define and run a comprehensive end-to-end validation matrix that confirms all tool integrations work correctly together on a real Azure Local cluster. This is the exit gate for the epic.

Scope

• Define validation matrix covering all tools × all workload profiles × all cluster configurations
• Automated validation runner that executes the full matrix and produces a pass/fail report
• Baseline result capture for regression detection in future runs
• Validation run documentation (cluster config, hardware spec, results)
• Integration with GitHub Actions for scheduled validation runs

Acceptance Criteria

• Validation matrix covers: FIO (5 profiles), HammerDB (TPC-C + TPC-H), iPerf (TCP + UDP), stress-ng (CPU + mem), VMFleet (2 profiles)
• All matrix items pass on reference hardware (Azure Local 2-node and 4-node clusters)
• Baseline results committed to reports/baseline/
• Validation runner can be triggered via CI/CD
• Epic [Epic] Load Testing Toolkit Full Build-Out #8 marked complete only after full matrix passes

Dependencies

• Parent Epic: [Epic] Load Testing Toolkit Full Build-Out #8
• All tool integrations: feat: FIO storage I/O benchmarking integration #12, feat: HammerDB database load testing integration (TPC-C / TPC-H) #13, feat: iPerf3 network throughput and stress-ng CPU/memory integration #14, feat: VMFleet S2D fleet storage testing integration #15
• Monitoring: feat: monitoring dashboards and alerting for test run telemetry #16
• Reports: feat: multi-format report generation (JSON, CSV, HTML, Markdown) #17
• CI/CD: infra: CI/CD pipelines (lint, test, release) #18