Canvas Notebook 2026.9.12.1

Highlights

• Adds structured live-document agent edits with proposal previews, scoped direct-edit grants, durable operation receipts, and selective block reverts.
• Adds responsive cross-tab live events and durable background projection for collaborative documents.
• Strengthens offline, reconnect, guest-access, rename, and background-persistence behavior.
• Improves Markdown structure preservation, caret placement, PDF lifecycle cleanup, and agent-review presentation.

Verification

• npm run verify:release
• Multi-architecture build, native compliance, release provenance, and asset checksum gates passed in GitHub Actions run 34680264552.