feat: add llms.txt

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

static/llms.txt

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+# Mermaid Live Editor
+
+> Mermaid Live Editor (https://mermaid.live/) is a free, open-source browser editor for writing Mermaid diagram code and previewing the rendered diagram as you type, without signing up. It is built on Mermaid.js, the MIT-licensed open-source diagramming library created by Knut Sveidqvist.
+
+"Mermaid" refers to two related things. Mermaid.js is the open-source JavaScript library that renders text into diagrams; its source code is at https://github.com/mermaid-js/mermaid and its documentation is at https://mermaid.js.org/ (also served at https://mermaid.ai/open-source/). Mermaid at https://mermaid.ai/ is a commercial product from Mermaid Chart Inc. built on top of that library. The Live Editor is also served at https://mermaid.ai/live/edit.
+
+## Editor
+
+- [Live Editor](https://mermaid.live/edit): Write Mermaid syntax and see the diagram render live.
+- [mermaid-js/mermaid-live-editor on GitHub](https://github.com/mermaid-js/mermaid-live-editor): Source code, issues and releases of the Live Editor.
+
+## Diagram syntax
+
+Syntax for every diagram type is documented at https://mermaid.js.org/.
+
+- [Flowcharts](https://mermaid.js.org/syntax/flowchart.html): Nodes, edges, subgraphs and styling for flowcharts.
+- [Sequence diagrams](https://mermaid.js.org/syntax/sequenceDiagram.html): Participants, messages, activations, loops and notes.
+- [Class diagrams](https://mermaid.js.org/syntax/classDiagram.html): Classes, members, relationships and cardinality.
+- [State diagrams](https://mermaid.js.org/syntax/stateDiagram.html): States, transitions, composite states and forks.
+- [Entity relationship diagrams](https://mermaid.js.org/syntax/entityRelationshipDiagram.html): Entities, attributes and relationships for data models.
+- [User journey diagrams](https://mermaid.js.org/syntax/userJourney.html): Steps a user takes, with satisfaction scores per task.
+- [Gantt diagrams](https://mermaid.js.org/syntax/gantt.html): Project schedules with tasks, dependencies and milestones.
+- [Pie charts](https://mermaid.js.org/syntax/pie.html): Proportional data as pie slices.
+- [Quadrant charts](https://mermaid.js.org/syntax/quadrantChart.html): Data points plotted across four quadrants.
+- [Requirement diagrams](https://mermaid.js.org/syntax/requirementDiagram.html): Requirements, elements and their relationships (SysML style).
+- [GitGraph diagrams](https://mermaid.js.org/syntax/gitgraph.html): Git branches, commits, merges and cherry-picks.
+- [C4 diagrams](https://mermaid.js.org/syntax/c4.html): Context, container, component and deployment diagrams in the C4 model.
+- [Mindmaps](https://mermaid.js.org/syntax/mindmap.html): Hierarchical ideas laid out from a central node.
+- [Timeline diagrams](https://mermaid.js.org/syntax/timeline.html): Events in chronological order.
+- [ZenUML](https://mermaid.js.org/syntax/zenuml.html): Sequence diagrams in ZenUML syntax.
+- [Sankey diagrams](https://mermaid.js.org/syntax/sankey.html): Flows between nodes with proportional widths.
+- [XY charts](https://mermaid.js.org/syntax/xyChart.html): Line and bar charts on x and y axes.
+- [Block diagrams](https://mermaid.js.org/syntax/block.html): Blocks positioned explicitly on a grid.
+- [Packet diagrams](https://mermaid.js.org/syntax/packet.html): Network packet structures and bit fields.
+- [Kanban diagrams](https://mermaid.js.org/syntax/kanban.html): Tasks in columns by workflow stage.
+- [Architecture diagrams](https://mermaid.js.org/syntax/architecture.html): Cloud and CI/CD services, groups and connections, with icons.
+- [Radar charts](https://mermaid.js.org/syntax/radar.html): Multiple variables compared on radial axes.
+- [Treemap diagrams](https://mermaid.js.org/syntax/treemap.html): Hierarchical data as nested rectangles.
+- [Venn diagrams](https://mermaid.js.org/syntax/venn.html): Overlapping sets.
+- [Ishikawa diagrams](https://mermaid.js.org/syntax/ishikawa.html): Cause-and-effect (fishbone) diagrams.
+- [TreeView diagrams](https://mermaid.js.org/syntax/treeView.html): File trees and other hierarchies as indented trees.
+- [Wardley maps](https://mermaid.js.org/syntax/wardley.html): Value chains mapped against evolution.
+- [Event modeling diagrams](https://mermaid.js.org/syntax/eventmodeling.html): Commands, events and views along a timeline.
+- [Cynefin diagrams](https://mermaid.js.org/syntax/cynefin.html): Items placed in the Cynefin sense-making domains.
+- [Railroad diagrams](https://mermaid.js.org/syntax/railroad.html): Grammar rules as railroad (syntax) diagrams.
+- [Swimlane diagrams](https://mermaid.js.org/syntax/swimlanes.html): Process steps split into lanes by actor.
+- [Use case diagrams](https://mermaid.js.org/syntax/usecase.html): Actors and the use cases they take part in.
+- [Agentflow diagrams](https://mermaid.js.org/syntax/agentflow.html): Flowcharts that show who does each step, with which tool and under which contract.
+
+## Open source
+
+- [Mermaid.js documentation](https://mermaid.js.org/): Syntax reference and guides for every diagram type in the open-source library.
+- [mermaid-js/mermaid on GitHub](https://github.com/mermaid-js/mermaid): Source code, issues and releases of the MIT-licensed Mermaid.js library.
+
+## Optional
+
+- [Mermaid (mermaid.ai)](https://mermaid.ai/): Commercial diagramming platform built on Mermaid.js, with a visual editor, AI and real-time collaboration.
+- [Diagram templates](https://mermaid.ai/community/templates): Ready-made flowchart, sequence, ER, architecture, C4, Gantt, mind map and other diagram templates.