fix: compact help modal — wider dialog, tighter tabs and spacing

feat: add help button to drop screen

docs: document content modes and updated ingestion pipeline in README

feat: mode-based ingest prompts with quality gate and constraint-first structure

docs: add footprint comparison section to README

docs: update help modal and README with persistent RAG index details

feat: persistent RAG vector index via IndexedDB

docs: rewrite README to cover ingestion pipeline, wiki maintenance, and new AI features

docs: update help modal with Ingest, Audit tabs and refreshed content

feat: auto-load last model + editable system prompt

Fix orphan notes: deterministic wikilinks + stronger prompt

Fix: Accept All button doesn't close the review overlay

Ingest queue: batch drain, chain processing, done-item fade

Fix: batch inbox files only process first item when auto-process is on

Add Tiers 1–3 of VaultMind ingestion system