feat(broker): migrations-based install, roles, RLS, and job dependency groups

Replace the ad-hoc tables/procedures install layout with versioned,
ordered SQL migrations tracked in broker_schema_migrations. Add
optional least-privilege role provisioning (--with-roles), multi-tenant
row-level security, lease-based job claiming with stale-lease recovery,
and job dependencies -- both by job id and by fan-in job group. Add
Docker/Compose support for running the broker and its test suite.

plan/docs/recommendations.md

@@ -1,5 +1,5 @@
 # PostgreSQL Schema and Function Recommendations
-
+/home/warkanum/.claude/plans/binary-puzzling-mountain.md
 **Review date:** 2026-09-14  
 **Scope:** `pkg/broker/install/sql` tables and functions, including their interaction with the Go worker.