ENG-1976 Add schema export command to Obsidian

[trangdoan982]

Summary

Adds the schema export command and settings entry point.

• nativeJsonFileDialogs.ts — Electron-safe wrappers for showSaveDialog and showOpenDialog; both consumers (export and import) import from here
• specExport.ts — serializes the vault's selected node types, relation types, relation triples, and templates into the DiscourseSchemaFile JSON format
• ExportSpecsModal.tsx — modal that renders SchemaSelectionModalBody + SchemaSelectionPanel; user selects items to export then saves to a filesystem location via the native save dialog
• GeneralSettings.tsx — adds "Export discourse graph schema" entry to the settings UI
• registerCommands.ts — registers export-dg-schema command in the command palette

Stack

PR 3 of 5 for FEE-840. Stacks on #1262.

1. Shared foundation — ENG-1975 (ENG-1975 Define schema file contract and shared foundation for Obsidian export/import #1180)
2. Schema selection panel UI — ENG-2083 (ENG-2083 Add schema selection panel UI for Obsidian export/import #1262)
3. This PR — schema export command (ENG-1976)
4. Schema import data layer (ENG-1977)
5. Schema import UI (ENG-2084)

Test plan

• pnpm --filter @discourse-graphs/obsidian check-types passes
• Command palette: Export discourse graph schema opens the export modal
• Settings entry opens the export modal
• Dependency enforcement: selecting a triple locks its source/dest node types and relation type
• Export saves a valid dg-schema-<vault>.json to the chosen filesystem location
• Exported JSON contains the selected node types, relation types, triples, and templates

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[linear-code]

ENG-1976

[supabase]

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1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
discourse-graph	Skipped		Jul 29, 2026 2:58am

[devin-ai-integration]

✅ Devin Review: No Issues Found

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