[Feature] Subconscious loop proactive nudges from live context #448

Enable subconscious loop to trigger proactive, context-aware nudges (example: while chatting on WhatsApp, suggest a missed point from user memory/goals). The feature should detect relevant context, match against memory, and show concise actionable suggestions without spamming.

Tasks:

• Define trigger policy (confidence threshold, cooldown, dedupe).
• Implement pipeline: context capture -> memory match -> score -> nudge.
• Add per-app/user controls (enable/disable, sensitivity, quiet hours).
• Add actionable nudge UX (accept/copy/dismiss/mute).
• Add safety/privacy guardrails and redacted logs.
• Add tests for trigger/no-trigger and duplicate suppression.

Acceptance:

• Nudges appear only on high-confidence matches.
• Suggestions are specific and actionable.
• Users can control/disable nudges.
• No repeated spam or duplicate nudges.