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>

docs/intent/mvp-userstories-intent-system.md

@@ -16,7 +16,7 @@ We splitsen de ontwikkeling in **MVP** (Wat we nu bouwen voor de publieke demo)
 2.  **Multi-Intent:** Het kunnen verwerken van samengestelde zinnen ("Zeg af en maak notitie").
 3.  **Context Awareness:** Het correct interpreteren van "hij", "deze", "morgen" o.b.v. de huidige schermstatus.
 4.  **UI Feedback:** Visualisatie van het "denkproces" en gestapelde resultaten (Stacked Cards).
-5.  **Basic Safety Net:** Eén hardcoded voorbeeld van proactiviteit (bijv. "Wondcontrole suggestie") om het concept te tonen.
+5.  **Basic Nudge:** Eén hardcoded voorbeeld van proactiviteit (bijv. "Wondcontrole suggestie") om het concept te tonen.
 
 ### ❌ Out of Scope (Post-MVP - "The Product")
 *Focus: Veiligheid, robuustheid, edge-cases.*