Add Hermes incident playbook example

[max-sudolabs]

Summary

• add a Python Hermes + E2B incident playbook example
• demonstrate Hermes creating a reusable incident-triage skill and applying it in a fresh session
• include deterministic fixtures, unit coverage, and cookbook navigation

Why

This example is designed around Hermes' distinctive self-improving loop: the first investigation learns a reusable procedure, while the second investigation demonstrates reuse in a new session. The two synthetic incidents make the learned decision rules observable.

Validation

• uv run python -m unittest discover -s tests -v (3 tests)
• uv run python -m compileall -q main.py tests
• git diff --check
• paired with the live Hermes template smoke from INT-51

Provider-backed Hermes inference E2E was intentionally not run here because the repository does not contain a provider secret; HERMES_TEMPLATE supports tagged/private template smoke during development.

Linear: https://linear.app/e2b/issue/INT-51/hermes-template