WIP: stage all uncommitted work — sprints 46-221, graduation headers, specialist fleet, test steps 909-1988

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tmp_eval_complex_specs_20260303/fs_004_java.md

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+# Schema Migration with Backfill (fs_004)
+
+## Objective
+Add normalized address schema, migrate legacy rows with backfill job, dual-read/write transition, and rollback script.
+
+## Language & Library Constraints
+- Primary language: java
+- Available libraries: spring-boot, jooq, flyway
+- Prefer explicit use of selected library APIs in task execution contracts.
+
+## Required Artifacts
+- db/migrations/*
+- service/address/*
+- jobs/backfill/*
+- rollback/*.sql
+- tests/migration/*
+
+## Acceptance
+- Generate deterministic taskitems with strict execution contracts.
+- Include selected library and preferred APIs per task where applicable.