Release smart-account-kit 0.8.0

[kalepail]

Summary

• release the accumulated breaking security changes as smart-account-kit@0.8.0
• keep smart-account-kit-bindings@0.4.0 and every contract artifact unchanged
• correct the clean-worktree release order so bindings build before tests

Verification

• 458 SDK tests, 4 indexer tests, and 39 relayer tests passed
• builds, ESM checks, demo builds, bindings parity, audit, pack dry run, authenticated release dry run, actionlint, and gitleaks passed
• canonical bindings remain tied to WASM SHA-256 1b5f4534a76322da2ad7c745f6900857a6802b0ca79850c35a03561df997785a

[Copilot]

Pull request overview

Releases the SDK as smart-account-kit@0.8.0 while preserving existing bindings and contract artifacts.

Changes:

• Synchronizes the SDK package and runtime versions to 0.8.0.
• Finalizes the accumulated changelog.
• Builds bindings before running release-validation tests.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
src/version.ts	Updates the exported runtime version.
package.json	Updates the npm package version.
docs/releasing.md	Corrects validation command order.
CHANGELOG.md	Marks accumulated changes as the 0.8.0 release.

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