refactor: rename swift → cortex in code and documentation

Complete rename of "swift" terminology to "cortex" across the codebase:

Code Changes:
- Rename directories: lib/swift → lib/cortex, components/swift → components/cortex
- Rename API routes: /api/swift/* → /api/cortex/*
- Rename page routes: /epd/swift → /epd/cortex
- Rename store: swift-store.ts → cortex-store.ts

Type Renames:
- SwiftIntent → CortexIntent
- SwiftStore → CortexStore
- useSwiftStore → useCortexStore
- SwiftContext → CortexContext
- useSwiftVoice → useCortexVoice

Documentation Updates (docs/intent/):
- Safety Net → Nudge (Layer 3 rename)
- SafetySuggestion → NudgeSuggestion
- evaluateSafetyNet → evaluateNudge
- SWIFT_* feature flags → CORTEX_*
- All path references updated to match new structure

Files affected: 47 files, ~700 lines changed

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

app/epd/components/epd-sidebar.tsx

@@ -47,7 +47,7 @@ interface EPDSidebarProps {
 
 // LEVEL 1: Behandelaar Context Navigation
 const level1NavigationItems: NavigationItem[] = [
-  { id: "swift", name: "Swift", icon: Zap, href: "/epd/swift" },
+  { id: "cortex", name: "Cortex", icon: Zap, href: "/epd/cortex" },
   { id: "dashboard", name: "Dashboard", icon: LayoutDashboard, href: "/epd/dashboard" },
   { id: "clients", name: "Cliënten", icon: Users, href: "/epd/patients" },
   {