Release/957.0.0

[michalconsensys]

Explanation

References

Checklist

• I've updated the test suite for new or updated code as appropriate
• I've updated documentation (JSDoc, Markdown, etc.) for new or updated code as appropriate
• I've communicated my changes to consumers by updating changelogs for packages I've changed
• I've introduced breaking changes in this PR and have prepared draft pull requests for clients and consumer packages to resolve them

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Note

Low Risk
Release-only metadata updates (version bumps and changelog edits) with no functional code changes in this diff. Main risk is downstream consumers needing to account for the documented @metamask/perps-controller v6 breaking API renames.

Overview
Bumps the core monorepo version to 957.0.0 and publishes @metamask/perps-controller as 6.0.0.

Updates the perps-controller changelog to add the 6.0.0 release notes (including documented breaking balance field renames) and adjusts compare links to anchor Unreleased off 6.0.0.

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