[T0] Orientation — what a database is & how to read this

[ianfinkdata]

Module: sql-trainer/curriculum/00-orientation/README.md
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Review pass for this SQL Trainer module.

Review checklist

• Technically accurate (claims true, analogies hold)
• Clear & at the right level (absolute beginner)
• Persona voice — plain English first, code only when it helps
• Sets up the rest of the curriculum well

Definition of done

Reviewed and either (a) approved with no changes, or (b) refined together until the problem and solution align.

Leave feedback in comments; we'll iterate here until it's done.

[ianfinkdata]

This looks great. Love the filing cabinet analogy