feat: Phase 4 - Notes + Graph + Wikilinks

- Wikilink parser: [[Title]], [[Title|Display]], [[entity_type:Title]] patterns
- Notes REST API: CRUD under /api/domains/[domainId]/notes/ with wikilink sync
- Note link service: idempotent wikilink resolution, backlinks, outgoing links
- Notes list page: search, filter (all/pinned/archived), domain selector
- Note editor: TipTap with backlinks panel and outgoing links display
- Graph data API: /api/domains/[domainId]/graph and /api/graph
- Graph view page: D3 force-directed graph with entity type filters, search, zoom
- Keyboard shortcuts: g g → graph, c n → new note
- 18 passing wikilink parser tests
- All API routes follow AGENTS.md contract (activity + pg_notify)

apps/web/hooks/use-keyboard-shortcuts.ts

@@ -43,6 +43,7 @@ export function useKeyboardShortcuts() {
         if (key === 'h') { router.push('/habits'); e.preventDefault(); return; }
         if (key === 'p') { router.push('/projects'); e.preventDefault(); return; }
         if (key === 'n') { router.push('/notes'); e.preventDefault(); return; }
+        if (key === 'g') { router.push('/graph'); e.preventDefault(); return; }
         if (key === 'r') { router.push('/reports'); e.preventDefault(); return; }
         if (key === 'c') { router.push('/calendar'); e.preventDefault(); return; }
         if (key === 'a') { router.push('/analytics'); e.preventDefault(); return; }
@@ -83,6 +84,11 @@ export function useKeyboardShortcuts() {
             document.dispatchEvent(new CustomEvent('open-create-project'));
             e.preventDefault();
           }
+          // c n — new note
+          if (window.location.pathname.startsWith('/notes')) {
+            document.dispatchEvent(new CustomEvent('open-create-note'));
+            e.preventDefault();
+          }
           // c s — new section (on project detail page)
           if (window.location.pathname.match(/^\/projects\/[^/]+$/)) {
             document.dispatchEvent(new CustomEvent('open-create-section'));