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docs: rewrite the README and build the agent skill from the website docs #1030

Job	Run time
Lockfile consistency	9s
Classify verification scope	9s
Static checks and unit + integration tests	10m 53s
Formatter performance guards	4m 59s
DuckDB E2E (CLI data)	8m 2s
DuckDB E2E (build virtual)	9m 49s
PostgreSQL integration and E2E tests	10m 59s
DuckDB E2E (build incremental)	7m 18s
DuckDB E2E (virtual environments)	12m 7s
DuckDB E2E (build core)	7m 3s
DuckDB E2E (integrations)	7m 5s
DuckDB E2E (CLI commands)	7m 44s
Dense all-rules compile (${{ matrix.models }} models)	-1s
Fresh-process compile cache (${{ matrix.models }} models)	-1s
Performance guards	-1s
Fresh-process compile (${{ matrix.models }} models)	-1s
Rules performance guards	-1s
Verify	2s
	1h 26m 14s