fix(db): recognize deployed migration head

[Komzpa]

Summary

• add the Alembic revisions needed for a current main build to recognize the deployed database migration head
• keep migration policy checks tolerant of older SQLite files that still carry legacy bridge columns or foreign-key wiring
• unblock helper-built live stacks that combine this PR with fix(compact): preserve tool search pairs #1606 from origin/main

Validation

• uv run --frozen python -c "from app.db.migrate import check_migration_policy; check_migration_policy(); print('policy_ok')"
• uv run --frozen python -m app.db.migrate --db-url sqlite:///migration-smoke.db upgrade
• uv run --frozen python -m app.db.migrate --db-url sqlite:///migration-smoke.db current
• uv run --frozen python -m app.db.migrate --db-url sqlite:///migration-smoke.db check
• git diff --check

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[Komzpa]

Closing: this was opened for a local deployment-state repair and should not be an upstream PR.