Revert "Release 687.0.0"

[cryptodev-2s]

Reverts #7190

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Note

Rolls back the 687.0.0 release, reverting package versions, changelogs, and dependency upgrades across the monorepo to the previous stable set.

• Monorepo:
  • Set root version to 686.0.0.
• Dependencies (global rollback):
  • Revert key deps: @metamask/network-controller 26.x → 25.x, @metamask/json-rpc-engine 10.2.0 → 10.1.1, @metamask/eth-json-rpc-provider 6.x → 5.0.1, @metamask/eth-block-tracker 15.x → 14.x, @metamask/transaction-controller 62.x → 61.3.x, @metamask/gas-fee-controller 26.x → 25.x, @metamask/preferences-controller 22.x → 21.x, and related peers.
• Packages:
  • Revert package versions and peerDeps across many modules (e.g., accounts-controller 35.x → 34.x, account-tree-controller 4.x → 3.x, address-book-controller 8.x → 7.x, bridge(-status)-controller 62.x → 61.x, assets-controllers 90.x → 89.0.1, multichain-* controllers, signature-controller 37.x → 36.x, etc.).
  • Update CHANGELOG links to reflect prior release baselines.
• Tooling:
  • Regenerate yarn.lock to match reverted versions.

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