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ci.yml / docs: add showcase example for database migration management (push) Failing after 0s
Adds a complete end-to-end walkthrough of the `agents db` command group, verified by the UAT system with real command outputs. Covers: - agents db --help (command discovery) - agents db current (fresh database: 41 pending migrations listed) - agents db history (full 41-revision DAG with branchpoints/mergepoints) - agents db history --format json (structured DAG for scripting) - agents db upgrade (applying all 41 migrations to head) - agents db current --format json (CI/CD integration pattern) - agents db downgrade -- -1 (relative rollback with -- separator) - agents db downgrade <revision-id> (targeted rollback) - agents db upgrade <revision-id> (targeted upgrade) - agents db upgrade --format json (idempotent upgrade with JSON output) Also updates examples.json index with the new entry.