[record_use] Require package: URIs in schema

[dcharkes]

Add package: library check to the json schema and validator.

Follow up of:

• [record_use] Update test data to package: URIs and cleanup dart2js tests #3069
• [record_use] Correctness: Specify what uris are used #2891

[github-actions]

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License Headers ✔️

// Copyright (c) 2026, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

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pkgs/hooks_runner/test_data/download_assets/hook/build.dart
pkgs/jni/test/debug_release_test.dart
pkgs/objective_c/example/command_line/lib/main.dart
pkgs/objective_c/lib/src/ns_input_stream.dart

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API leaks ✔️

The following packages contain symbols visible in the public API, but not exported by the library. Export these symbols or remove them from your publicly visible API.

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Breaking changes ✔️

Package	Change	Current Version	New Version	Needed Version	Looking good?
record_use	Breaking	0.4.2	0.5.0-wip	0.5.0-wip	✔️

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[goderbauer]

LGTM

[coveralls]

coverage: 77.183% (+0.1%) from 77.068%
when pulling 3c57977 on record-use-schema-constraint
into 0838740 on main.