Model graph: decisions and registry files as nodes

- one node per decision (tag coloured by status) with decides links to its elements and supersedes links
- one node per registry file with defines links to its elements
- own legend chips, side panels (Open decision, Open registry), type:decision and type:registry
- walks and paths follow the diagrams' connections only; attached nodes follow their elements into a result

CHANGELOG.md

@@ -2,9 +2,9 @@
 
 ## 0.9.0 — 2026-10-21
 
-- **Model graph.** A **Model | Graph** switch on the `main.archify` page (next to **Export** when the file has a diagram, top right otherwise) replaces the page with the whole model as one graph: every element any diagram draws plus every registry element, every connection between them, each once, drawn with Cytoscape.js in Archify's type colours. Registry elements have a solid border, inline ones a dashed border. Drag, zoom, **Fit**, **Layout**, **Labels**, legend chips that hide a type, **Export PNG**. The choice is remembered per file; the graph updates in place as the model changes.
-- **Queries.** A query box narrows the graph: `database`, `type:backend`, `diagram:0200-*`, `decision:<id>`, `uses:api`, `near:api,2`, `from:web to:db` (shortest path), `unused`, `shared`, `-shared`; terms AND together, a leading `-` excludes; the count reads "9 of 14 elements"; **?** lists the forms and runs an example on click.
-- **Side panel.** An element shows its description, type, registry file and line (**Registry** opens it), the diagrams that draw it, its connections and its decisions, each one click away; **Neighbours** queries around it. A connection shows its labels, diagrams and decisions.
+- **Model graph.** A **Model | Graph** switch on the `main.archify` page (next to **Export** when the file has a diagram, top right otherwise) replaces the page with the whole model as one graph: every element any diagram draws plus every registry element, every connection between them, each once, drawn with Cytoscape.js in Archify's type colours. Registry elements have a solid border, inline ones a dashed border. **Decisions** and **registry files** are nodes as well: a decision is a tag coloured by status with dotted links to the elements and connections it is about and dashed links to what it supersedes; a registry links to the elements it defines. Drag, zoom, **Fit**, **Layout**, **Labels**, legend chips that hide a type (decisions and registries included), **Export PNG**. The choice is remembered per file; the graph updates in place as the model changes.
+- **Queries.** A query box narrows the graph: `database`, `type:backend`, `diagram:0200-*`, `decision:<id>`, `uses:api`, `near:api,2`, `from:web to:db` (shortest path), `unused`, `shared`, `-shared`, `type:decision`, `type:registry`; terms AND together, a leading `-` excludes; decisions and registries follow their elements into a result, and walks never pass through them; the count reads "9 of 14 elements"; **?** lists the forms and runs an example on click.
+- **Side panel.** An element shows its description, type, registry file and line (**Registry** opens it), the diagrams that draw it, its connections and its decisions, each one click away; **Neighbours** queries around it. A connection shows its labels, diagrams and decisions. A decision node shows its status, text, the elements and connections it is about and **Open decision**; a registry node the elements it defines and **Open registry**.
 - **Entry points.** On a diagram page inside a model the switch reads **Diagram | Graph** and opens the graph narrowed to `diagram:<that diagram>`. New command *Archify | Open Model Graph* in the editor title, the Command Palette and the Explorer menu, wherever *Open Model* is.
 - Diagram summaries in the model index now carry every node and edge of a diagram (shared and inline), which the graph is built from.