Bump version to 6.0.0-beta.1

release_notes/6.0.0-beta.1.md

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+# Jasmine Core 6.0.0-beta.1 Release Notes
+
+This is a pre-release, intended to offer a preview of upcoming changes and to
+solicit feedback.
+
+A corresponding release of the `jasmine` package is not planned because the 
+change in this release only affects browser users.
+
+## A Note About Pre-Release Compatibility
+
+There may be additional breaking changes in future 6.0 pre-releases or in the
+final 6.0 release. That's allowed by the semver specification, but users are
+sometimes unpleasantly surprised by it.
+
+NPM's implementation of carat version ranges assumes that subsequent
+pre-releases and final releases are fully compatible with earlier pre-releases.
+If your package.json contains `"jasmine-core": "^6.0.0-beta.1`,
+NPM might install any later 6.x version even though there is no guarantee of
+compatibility. If that isn't ok, you should specify an exact pre-release version:
+`"jasmine-core": "6.0.0-beta.1`.
+
+## Bug Fixes
+
+* Revert to using window.onload in boot1.js. This fixes top level await in
+  jasmine-browser-runner.
+
+## Supported environments
+
+This version has been tested in the following environments.
+
+| Environment       | Supported versions             |
+|-------------------|--------------------------------|
+| Node              | 20, 22, 24                     |
+| Safari**          | 16, 17, 26.1                   |
+| Chrome            | 143*                           |
+| Firefox           | 102**, 115**, 128**, 140, 145* |
+| Edge              | 142*                           |
+
+\* Evergreen browser. Each version of Jasmine is tested against the latest
+version available at release time.<br>
+\** Supported on a best-effort basis. Support for these versions may be dropped
+if it becomes impractical, and bugs affecting only these versions may not be
+treated as release blockers.
+
+------
+
+_Release Notes generated with _[Anchorman](http://github.com/infews/anchorman)_