[bashhack]

The README edits reviewed today, in one PR touching only README.md:

• New tagline: real isolation for every test, PostgreSQL or MySQL, cloned from a template in milliseconds.
• Features list updated for both databases, with a Templates bullet.
• "Why testdb?" rewritten around isolation with speed, safe sharing between processes, nothing to install, and the same bar on every supported database; a table comparing the approaches (shared database, transaction rollback, fresh database per test, testdb).
• "How It Works" rewritten to cover both databases.
• Details brought in line with the code: mysql.SQLFiles and mysql.SQLDBInitializer named, measurements attributed to an M5 MacBook Air with the server settings stated, MariaDB 11.4 now listed as tested in CI, the pool's warm-up and what a MySQL clone deliberately skips, the MySQL examples noted as compile-checked, and Release errors checked in the multi-template example.

[codecov-commenter]

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✅ All modified and coverable lines are covered by tests.

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