Claude-generated cleanup of integration test scripts in favor of single script

[jaggederest]

Don't feel too obliged to merge or intensively review this - if there are issues I can regenerate as needed based on feedback, this is really just a spike.

[CLAassistant]

All committers have signed the CLA.

[Copilot]

Pull Request Overview

This PR consolidates multiple integration test scripts into a single test runner and strengthens setup, utility, cleanup, and prerequisite checks.

• Adds a unified integration/test script to run and clean up tests across languages.
• Enhances setup.sh with error rollback and updates common.sh with improved process management utilities.
• Introduces cleanup.sh, refines prerequisite checks, and updates documentation.

Reviewed Changes

Copilot reviewed 6 out of 8 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
integration/test	New single-command integration test runner
integration/setup.sh	Improved setup with error handling and rollback
integration/common.sh	Enhanced utilities for starting/stopping PgDog/tests
integration/cleanup.sh	New script to teardown test environment
integration/check-prerequisites.sh	Expanded checks for tools, ports, and permissions
integration/README.md	Documentation updates for usage and prerequisites

Comments suppressed due to low confidence (2)

integration/README.md:9

• The README references './test' but the actual test runner script is located at 'integration/test'. Update the path to './integration/test' to match the repository structure.

./test

integration/setup.sh:78

• The PGUSER export is commented out, so psql may default to the OS user. Consider exporting PGUSER='pgdog' to ensure all setup commands consistently connect as the pgdog superuser.

export PGPORT=5432