Release 7.0.0

[rekmarks]

Bumps @metamask/ocap-kernel, @metamask/kernel-utils, and all downstream packages.

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Note

Low Risk
Low risk: this PR only updates package versions and changelog entries, with no runtime code changes. The main impact is on release metadata and downstream consumers picking up new (including breaking) versions.

Overview
Bumps the monorepo version to 7.0.0 and updates multiple package versions (e.g., @metamask/ocap-kernel to 0.7.0, kernel-utils to 0.5.0, and downstream packages accordingly).

Updates each package CHANGELOG.md with the corresponding release sections and compare links, including noting breaking API changes (e.g., branded identifier types and kernel-store API adjustments) as part of the release notes.

^{Reviewed by Cursor Bugbot for commit 12f78e5. Bugbot is set up for automated code reviews on this repo. Configure here.}

[github-actions]

Coverage Report

Status	Category	Percentage	Covered / Total
🔵	Lines	78.58% 🟰 ±0%	8615 / 10963
🔵	Statements	78.39% 🟰 ±0%	8750 / 11162
🔵	Functions	76.12% 🟰 ±0%	2018 / 2651
🔵	Branches	76.24% 🟰 ±0%	3708 / 4863

File Coverage

No changed files found.

Generated in workflow #4229 for commit 12f78e5 by the Vitest Coverage Report Action

[sirtimid]

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