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docs: add a roadmap and mark beta warehouses #1028

Job	Run time
Classify verification scope	7s
Lockfile consistency	10s
Formatter performance guards	6m 28s
DuckDB E2E (build core)	7m 16s
PostgreSQL integration and E2E tests	11m 2s
DuckDB E2E (build incremental)	9m 21s
DuckDB E2E (CLI data)	8m 6s
DuckDB E2E (CLI commands)	9m 18s
DuckDB E2E (build virtual)	9m 50s
Static checks and unit + integration tests	13m 15s
DuckDB E2E (integrations)	7m 6s
DuckDB E2E (virtual environments)	12m 46s
Dense all-rules compile (${{ matrix.models }} models)	-1s
Fresh-process compile cache (${{ matrix.models }} models)	-1s
Rules performance guards	-1s
Fresh-process compile (${{ matrix.models }} models)	-1s
Performance guards	-1s
Verify	3s
	1h 34m 43s