hermes - 💡(How to fix) Fix Roadmap: add structured observability for agent runs

Summary

Build structured observability into the Hermes core loop across model calls, tool calls, plugin hooks, memory calls, routing, and platform delivery.

Proposed scope

• Add structured spans for model calls, tool calls, plugin hooks, memory calls, and gateway delivery.
• Attribute tokens, cost, and latency per session, tool, provider, and platform.
• Add slow tool/provider diagnostics.
• Trace provider fallback decisions.
• Surface prompt/cache hit diagnostics where available.
• Export run bundles for debugging and support.

Acceptance criteria

• Operators can answer why a run was slow, expensive, or failed.
• Observability remains opt-in where it leaves the local machine or emits telemetry.
• Debug bundles avoid leaking secrets by default.