Add graph markdown and canvas outputs

specs/versions/0.1/commands.md

@@ -94,9 +94,20 @@ gsp pack <id> [--root .] [--depth 3] [--budget 12000] [--out context-pack.json]
 Generate a relation graph.
 
 ```bash
-gsp graph [id] [--root .] [--depth 3] [--format json|mermaid] [--out graph.json]
+gsp graph [id] [--root .] [--depth 3] [--format json|mermaid|md|canvas] [--out graph.json]
 ```
 
+Formats:
+
+```text
+json      Machine-readable graph.
+mermaid   Mermaid graph body.
+md        Markdown file with Mermaid block.
+canvas    Obsidian JSON Canvas file.
+```
+
+Graph display uses `title` when present and falls back to `id`.
+
 ## stage-check
 
 Check minimum resolution for a stage.