Mirrors test_alembic_default_workspace_id pattern: synchronous bodies
(env.py uses asyncio.run internally), pre-PR5 schema bootstrap with the
minimal columns the migration touches, upgrade/downgrade assertions for
the workspace_id column + FK + composite index on all 4 business tables.
Postgres cases auto-skip when Docker daemon is unreachable.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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