feat: add optional live skill evolution smoke

[ohkyuetaek]

Summary

• Add an optional live provider smoke runner for Phase 1 skill evolution
• Add a fixture Hermes skill repo and small golden dataset for the smoke path
• Document API-free regression tests vs manual live-provider smoke runs
• Ignore generated output artifacts

Dependency

• Stacked on fix: harden phase 1 skill evolution path #75. This PR should be reviewed/merged after fix: harden phase 1 skill evolution path #75 or rebased once fix: harden phase 1 skill evolution path #75 lands.

Verification

• .venv/bin/python scripts/run_live_skill_evolution_smoke.py --print-command-only
• .venv/bin/python -m pytest tests/test_live_smoke_script.py -q → 5 passed
• .venv/bin/python -m pytest -q → 150 passed, 11 DSPy deprecation warnings
• git diff --check
• Static added-line scan: no hardcoded secrets, shell=True/os.system, eval/exec, or pickle.loads
• Independent pre-commit review: passed; only follow-up suggestions for future cost-control/usability hardening

Notes

• The live smoke path is manual-only and may incur provider cost. It prints the underlying command safely with shell quoting and checks known provider credential env vars before live execution.