Enable Lumo AI to automatically organize, tag, and summarize saved cards in Proton Brain/Drive—zero-knowledge semantic search and connection discovery.

BACKGROUND:
This complements the "Proton Brain" feature request (UI focus). This one focuses on the intelligence layer that makes the system actually useful.

CURRENT STATE:
Users manually tag, categorize, and link notes. This is tedious and rarely done consistently. MyMind solves this with AI but sacrifices privacy.

REQUESTED CAPABILITIES:
1. Automatic Card Enrichment (Opt-In):
- On save: Lumo generates summary (TL;DR, max 3 sentences)
- Auto-tags extraction (3-7 relevant tags per card)
- Entity recognition (people, places, topics mentioned)
- Language detection + multilingual support

1. Semantic Search:

   • Natural language queries across all cards
   • Example: "What did I save about GDPR compliance last year?"
   • Finds cards even if exact keywords aren't present
   • Results ranked by relevance, not just keyword match

2. Connection Discovery:

   • Lumo suggests related cards ("You also saved X about this topic")
   • Suggests bidirectional links between notes
   • Identifies recurring themes over time
   • "Weekly Insights" digest of connected topics

3. Smart Spaces (Auto-Organization):

   • Lumo proposes Spaces based on content clusters
   • Example: "I noticed 12 cards about 'Privacy Legislation'—create Space?"
   • Manual override allowed; never forced
   • Nested Spaces supported (Projects → Subprojects)

4. Card Actions via Lumo:

   • "Summarize this collection of 20 cards"
   • "Find all cards mentioning [person/topic]"
   • "Generate outline from these research notes"
   • "Convert these meeting notes into action items"

5. Privacy Architecture (Critical):

   • All indexing/search happens client-side OR in trusted execution environment
   • Server never sees decrypted content
   • Opt-in only (disabled by default for new users)
   • No model training on user data (explicit policy)
   • Delete any card → instant removal from index

TECHNICAL IMPLEMENTATION PATH:
Phase 1 (6 months): Server-side inference with encrypted payloads (MVP)
Phase 2 (12 months): Hybrid model with client-side lightweight inference
Phase 3 (18 months): Full zero-knowledge semantic search with TEE

COMPETITIVE DIFFERENTIATORS:
- Notion: AI but zero privacy guarantees
- MyMind: AI but opaque encryption practices
- Obsidian: Privacy but no native AI
- Proton Brain: BOTH privacy AND intelligence

VALUE PROPOSITION:
Power users get AI-powered organization without becoming AI companies' training data. Journalists, lawyers, researchers, and activists finally have a PKM tool they can trust with sensitive information.

PRICING RECOMMENDATION:
- Lumo Plus required for AI features (justifies premium tier)
- Free tier: Manual tags only, 10 AI summaries/month
- Visionary: Unlimited AI processing included

LINK TO RELATED:
See also: https://protonmail.uservoice.com/forums/932839-proton-drive/suggestions/51632422-proton-brain-zero-knowledge-second-brain-with-car