feat(examples): add repeatable Harbor Hermes Switchyard eval

[bbednarski9]

Summary

Adds a self-contained Harbor Terminal-Bench example that runs Hermes through Relay 0.7.0 and the Switchyard plugin, without a Fabric dependency.

• separates committed plugins.toml configuration from an untracked, machine-local Phase 2 environment file
• adds durable, resumable cohort supervision with configurable concurrency and resource admission checks
• adds all-89 dataset wiring smoke coverage, regression/offline compatibility gates, and parallel-isolation validation
• preserves per-task validation, artifact finalization, OpenInference export, and provenance evidence

Why

Phase 2 runs need to be repeatable on other hosts before scaling evaluation throughput. The example now supports a host-specific private env file while keeping routing/plugin policy in the versioned template.

Validation

• exercised the Phase 2 runner locally
• git diff --check origin/main...HEAD
• credential audit of the proposed commits: no private env, key, PEM, or credential-signature content; committed authorization is a replacement placeholder only

Notes

This is intentionally a draft while the Phase 2 evaluation and cross-machine run are being completed.

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