Add a builtin _editor plugin that owns Markdown API/WebSocket sessions, canvas and modal UI, live refresh, tabs, prompt Extras for active-context open files, inline close confirmation, and Close All handling.
Route Markdown document artifacts to Editor while keeping Office/Desktop focused on LibreOffice formats, and update Desktop/Office prompts, menus, compatibility shims, and regression coverage.
Make file creation opt-in through document_artifact, move document file cards to final responses, and keep the tool payload as a quiet execution record.
Deduplicate response cards by file identity, refresh open Desktop canvas sessions after saved edits, and harden document_artifact edit input normalization for common append/update shapes.
Update prompts, skills, styles, and regression coverage for response-only file actions and explicit-only canvas opening.
Attach the Browser canvas to active Docker sessions by returning an initial snapshot on subscribe and preserving valid frames through state-only updates. Route Markdown document opens through the right-canvas Desktop editor instead of the legacy office modal. Skip automatic office document response affordances for subordinate agents so delegated reviews keep their actual content.
Keep _office focused on document artifacts, Markdown sessions, LibreOffice-compatible file actions, and document persistence. Route binary document editing through explicit Desktop requests instead of cold-opening the live Desktop surface from artifact results.
Keep Office document artifacts from auto-opening the canvas while adding plugin-owned Download and Open in canvas message actions. Add format-specific skills for Markdown, Word, Excel, and presentation workflows, and clarify the startup-warmed Desktop runtime remains visually opt-in.\n\nCover the Excel method=create path, Markdown-first/no-auto-open policies, response affordance copy, document action buttons, and Desktop bootstrap with focused regressions.
