Release diagram Tools v0.1.0

public/docs/ACCESSIBILITY.md

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+# Accessibility
+
+The editor, buttons, zoom and diagnostics use native controls with visible focus. Every visual diagram has a textual node/member/edge outline. The studio reflows on small screens and follows shell themes.

public/docs/ARCHITECTURE.md

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+# Architecture
+
+`core/diagram.ts` parses one fixed grammar into nodes, edges and line diagnostics, then lays it out deterministically as escaped SVG. Sequence diagrams use lifelines; other modes use a bounded grid. React shows the last successful SVG after errors and delegates PNG rasterization to a local canvas.

public/docs/PRIVACY-SECURITY.md

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+# Privacy and security
+
+Source remains in memory; explicit SVG/PNG downloads are the only output. There is no telemetry, remote asset resolution, HTML injection, eval, directive execution or URL fetch. Complexity and raster output are capped.