229 pgc includes temporary session schemas pg temp when using scheme

[nettrash]

Closes #229

[Copilot]

Pull request overview

This PR fixes issue #229 by preventing PGC’s schema-resolution step (used by dump/compare/clear) from ever selecting PostgreSQL system/temporary session schemas when --scheme is broad (e.g., %), avoiding invalid create schema pg_temp_N output.

Changes:

• Updates schema resolution SQL to exclude all pg_-prefixed schemas (covers pg_catalog, pg_toast, pg_temp_*, pg_toast_temp_*) while keeping information_schema excluded.
• Refactors the schema-resolution query into a dedicated Dump::build_schemas_query() helper for reuse/testing.
• Adds a unit test asserting the query contains the intended exclusions and updates the CHANGELOG entry for #229.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
CHANGELOG	Documents the #229 fix and rationale (exclude pg_-prefixed schemas during schema resolution).
app/src/dump/core.rs	Centralizes schema-resolution SQL and applies pg_ prefix exclusion via NOT LIKE 'pg\\_%'.
app/src/dump/core_tests.rs	Adds a regression-style test to ensure schema-resolution query excludes pg_ schemas and information_schema.

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