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docs: say end-to-end tests in the README, homepage and docs introduction #1362

Job	Run time
Classify verification scope	10s
Lockfile consistency	14s
Build wheel (${{ matrix.platform.name }})	-1s
Native discovery on Python ${{ matrix.python }}	0s
Fresh-process compile cache (${{ matrix.models }} models)	0s
Verify	4s
Performance guards	0s
DuckDB E2E (${{ matrix.name }})	0s
Rules performance guards	0s
PostgreSQL integration and E2E tests	0s
Same-runner compile ratio (${{ matrix.kind }} 3000 models)	0s
Compiler engine differential	0s
Formatter performance guards	0s
Fresh-process compile (${{ matrix.models }} models)	0s
Static checks and unit + integration tests	0s
Dense all-rules compile (${{ matrix.models }} models)	0s
	27s