Promote: SVG gen + office tools + v2 code-canvas - #357
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Add a generative executor (mapped to svg-viewer): the LLM writes <svg> markup for an icon/logo/diagram, we sanitize it (DOMPurify SVG profile — strips scripts, handlers, foreignObject) and return a rendered, downloadable graphic. New svg-gen.lib (extractSvg/sanitizeSvg/svgToDataUrl). Chat previews now keep aspect ratio (max-h-64) so diagrams aren't squished.
feat(agent): SVG generation — the model draws icons & diagrams
… word count Add csv-dedupe (remove duplicate rows), spreadsheet-convert (CSV<->xlsx via SheetJS, auto-detects direction), and word-count (words/chars/reading time). They chain: 'remove duplicate rows from this csv and give me an Excel file' runs csv-dedupe -> spreadsheet-convert on the piped output. Decouples executor function name from its page ref (new optional 'page' field) so several ops can map to one tool page; adds a duplicate-name guard.
New canvas-draw executor: the LLM writes JS that draws on a 2D ctx; it runs in a locked-down Web Worker (no DOM, no network — fetch/XHR/WebSocket/importScripts/ indexedDB/caches neutered; OffscreenCanvas only) with a 6s timeout enforced by the main thread terminating the worker → returns a PNG. For charts, plots and procedural/pixel graphics SVG can't express. extractCode/runCanvasCode/blobToDataUrl in canvas-run.lib; sandbox in canvas-sandbox.worker.
feat(agent): office tools + v2 sandboxed code-canvas
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Promotes SVG generation (#355), office executors (csv-dedupe/CSV↔Excel/word-count) and the v2 sandboxed code-canvas (#356) to production.