[cupertino_http] prepare v3.0.0 release

[brianquinlan]

Prepares the release of package:cupertino_http v3.0.0 by removing the -wip suffix from the pubspec and changelog, and updating the examples.

[github-actions]

Package publishing

Package	Version	Status	Publish tag (post-merge)
package:cronet_http	1.9.0-wip	WIP (no publish necessary)
package:cupertino_http	3.0.0	ready to publish	cupertino_http-v3.0.0
package:http	1.6.1-wip	WIP (no publish necessary)
package:http2	3.0.1-wip	WIP (no publish necessary)
package:http_multi_server	3.2.2	already published at pub.dev
package:http_parser	4.1.3-wip	WIP (no publish necessary)
package:http_profile	0.1.1-wip	WIP (no publish necessary)
package:ok_http	0.1.1-wip	WIP (no publish necessary)
package:web_socket	1.0.1	already published at pub.dev
package:web_socket_channel	3.0.4-wip	WIP (no publish necessary)

Documentation at https://github.com/dart-lang/ecosystem/wiki/Publishing-automation.

[github-actions]

PR Health

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.

Files
no missing headers

All source files should start with a license header.

Unrelated files missing license headers

Files
pkgs/cupertino_http/example/example.dart
pkgs/http/example/main.dart
pkgs/http_multi_server/test/cert.dart

This check can be disabled by tagging the PR with skip-license-check.

Breaking changes ✔️

Package	Change	Current Version	New Version	Needed Version	Looking good?
cupertino_http	Breaking	2.4.0	3.0.0	3.0.0	✔️

This check can be disabled by tagging the PR with skip-breaking-check.

Coverage ✔️

File	Coverage

This check for test coverage is informational (issues shown here will not fail the PR).

This check can be disabled by tagging the PR with skip-coverage-check.

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.

Package	Leaked API symbol	Leaking sources

This check can be disabled by tagging the PR with skip-leaking-check.

Unused Dependencies ⚠️

Package	Status
cupertino_http	❗ Show Issues These packages are used outside lib/ but are not dev_dependencies: * flutter * integration_test These packages are only used outside lib/ and should be downgraded to dev_dependencies: * hooks * logging * native_toolchain_c These packages may be unused, or you may be using assets from these packages: * dart_flutter_team_lints Failed to update packages.

For details on how to fix these, see dependency_validator.

This check can be disabled by tagging the PR with skip-unused-dependencies-check.

Changelog Entry ✔️

Package	Changed Files

Changes to files need to be accounted for in their respective changelogs.

This check can be disabled by tagging the PR with skip-changelog-check.