Adds the migration and metadata spec for the hunting schema (monster definitions, location monster spawn tables, hunts, and hunt encounters) required by Playable Slice 0.2. Mirrors the raw-SQL style of the visible vertical slice migration; explicitly asserts the CASCADE-vs-RESTRICT deviation on HuntEncounter's relation to Hunt. Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>