Hephaestus v0.6.1

New hephaestus-cloud command — searches only your own cloud packages (보관함) at a flat 1-credit call price. Completes the three-scope model: hephaestus-cloud (own) / hephaestus-network (Hub marketplace, per-agent price) / default (local + cloud + Hub). Registered across all runtime adapters; full test suite + verify-package green.