Refactor itests

[n-r-w]

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[Copilot]

Pull request overview

This PR refactors the integration tests to use the scany library for row scanning instead of manual row iteration and scanning. The change simplifies test code by replacing verbose pgx row handling with struct-based scanning using pgxscan.Select() and pgxscan.Get().

Changes:

• Replaced manual row iteration and rows.Scan() with pgxscan.Select() for multi-row queries
• Replaced QueryRow().Scan() with pgxscan.Get() for single-value and single-row queries
• Added struct definitions with db tags to support struct-based scanning
• Updated documentation to reference integration tests as examples of using scany

Reviewed changes

Copilot reviewed 6 out of 7 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
itests/write_test.go	Refactored to use pgxscan for INSERT, UPDATE, and DELETE queries with RETURNING clauses
itests/select_test.go	Refactored to use pgxscan for complex SELECT queries with struct-based result mapping
itests/db_test.go	Refactored helper functions to use pgxscan for scanning query results
go.mod	Added scany/v2 v2.1.4 dependency
go.sum	Added checksums for scany and its transitive dependencies
README.md	Added reference to integration tests as examples for using scany
AGENTS.md	Documented scany as part of the tech stack

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