fix(vscode): restore session state on first redo

[marius-kilocode]

This is a simple bug where a duplicate event would cause the reset button to fail on the first click.

Redo could restore files while leaving the revert checkpoint visible until it was clicked a second time. Partial sync patches and full session bus snapshots both arrived as session.updated, so the extension merged full snapshots as patches and preserved optional revert state that the snapshot intentionally omitted.

Distinguish unwrapped sync patches from full bus snapshots. Partial updates continue to merge into the cached session, while full snapshots replace it and are forwarded as complete updates, allowing cleared optional state to reach the webview immediately. Regression coverage protects full-snapshot clearing and the revert mutation update path.

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Files Reviewed (4 files)

• .changeset/fast-redos-return.md
• packages/kilo-vscode/src/KiloProvider.ts
• packages/kilo-vscode/tests/unit/kilo-provider-utils.test.ts
• packages/kilo-vscode/tests/unit/revert-checkpoints.test.ts

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_{Reviewed by claude-4.6-sonnet-20260217 · 1,847,517 tokens}

_{Review guidance: REVIEW.md from base branch main}