diff --git a/AGENTS.md b/AGENTS.md
index 4e6dfb7f..e89f229d 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -58,8 +58,10 @@ v20 but fails during `loadModel` in Electron for models over ~500 MB.
 **Workaround:** Use the smaller Qwen 0.5B model (~469 MB) which loads and runs successfully:
 
 ```bash
-# Download the smaller model
-curl -L -o ~/.config/stratosort-core/models/qwen2.5-0.5b-instruct-q4_k_m.gguf \
+# Download the smaller model into the CORRECT userData models directory
+# IMPORTANT: The app's LlamaService looks in ~/.config/StratoSort Core/models/ (with space),
+# NOT ~/.config/stratosort-core/models/ (the legacy postinstall path).
+curl -L -o "$HOME/.config/StratoSort Core/models/qwen2.5-0.5b-instruct-q4_k_m.gguf" \
   "https://huggingface.co/Qwen/Qwen2.5-0.5B-Instruct-GGUF/resolve/main/qwen2.5-0.5b-instruct-q4_k_m.gguf"
 
 # Update settings to use it
@@ -72,6 +74,13 @@ with open(f, 'w') as fh: json.dump(s, fh, indent=2)
 "
 ```
 
+**Model directory note:** The `postinstall` script downloads models to
+`~/.config/stratosort-core/models/` (lowercase, no space), but the running app resolves
+models via `app.getPath('userData')` which is `~/.config/StratoSort Core/models/` (with
+space). If a model exists only in the legacy path, the LlamaService will not find it and will
+fall back to the default large model (which crashes). Always place models in the userData
+path.
+
 With this model, the full pipeline works: file import → AI analysis (90-95% confidence, ~50s/file on
 CPU) → organization suggestions → semantic search.
 
diff --git a/docs/E2E_WALKTHROUGH.md b/docs/E2E_WALKTHROUGH.md
new file mode 100644
index 00000000..9e90f5ac
--- /dev/null
+++ b/docs/E2E_WALKTHROUGH.md
@@ -0,0 +1,586 @@
+# StratoSort Core — End-to-End Walkthrough
+
+A visual guide to every screen and feature in StratoSort Core, captured from the production
+Linux AppImage (v2.0.4). Each section maps to one phase of the app workflow.
+
+> **Platform shown:** Ubuntu Linux, AppImage distribution
+> **Launch command:** `./StratoSortCore-2.0.4-linux-x86_64.AppImage`
+
+---
+
+## Table of Contents
+
+1. [First Launch & Model Setup](#1-first-launch--model-setup)
+2. [Welcome Phase](#2-welcome-phase)
+3. [Setup Phase — Smart Folders](#3-setup-phase--smart-folders)
+4. [Discover Phase — File Analysis](#4-discover-phase--file-analysis)
+5. [Organize Phase — Review & Execute](#5-organize-phase--review--execute)
+6. [Complete Phase — Summary](#6-complete-phase--summary)
+7. [Search & Knowledge OS](#7-search--knowledge-os)
+8. [Settings — Full Reference](#8-settings--full-reference)
+9. [Videos](#9-videos)
+
+---
+
+## 1. First Launch & Model Setup
+
+On first launch, StratoSort checks for AI models in `~/.config/stratosort-core/models/`. If
+required models are missing, a setup wizard guides you through downloading them.
+
+### Model Selection
+
+The wizard presents installation profiles and lets you choose which models to install:
+
+| Model Type | Purpose | Required? |
+|:-----------|:--------|:----------|
+| **Embedding Model** (Nomic Embed Text v1.5) | Converts text to vectors for semantic search | Yes |
+| **Text Analysis Model** (Qwen / Llama) | Analyzes documents and generates descriptions | Yes |
+| **Vision Model** (LLaVA) | Analyzes images and screenshots | Optional |
+
+![Model Setup Wizard](../e2e-screenshots/13_model_setup_wizard_detailed.webp)
+<!-- Video: ../e2e-videos/03_discover_analysis_and_model_setup.mp4 -->
+
+The wizard shows installation status for each model (Installed / Not installed) with download
+size estimates. Three action buttons are available:
+
+- **Download Models** — begins downloading selected models
+- **Refresh** — re-checks local model availability
+- **Continue with limited AI** — skips setup and enters the app immediately
+
+### Download Progress
+
+During download, you see per-model progress bars with download speed and completion percentage.
+You can continue using the app while models download in the background.
+
+![Model Download Progress](../e2e-screenshots/10_model_download_wizard.webp)
+
+---
+
+## 2. Welcome Phase
+
+After model setup (or if models are already present), you land on the Welcome screen.
+
+![Welcome Screen](../e2e-screenshots/01_welcome_screen.webp)
+
+### Navigation Bar
+
+The top bar is always visible and contains:
+- **StratoSort logo** with connection status indicator (green = AI engine ready)
+- **Phase tabs:** Welcome → Setup → Discover → Organize → Complete
+- **Search button** — opens the floating search widget / Knowledge OS
+- **Settings gear** — opens the configuration panel
+- **Window controls** — minimize, maximize, close
+
+### Welcome Actions
+
+| Action | What It Does |
+|:-------|:-------------|
+| **Organize files now** | Jumps straight to Discover with smart defaults |
+| **AI & model settings** | Opens the Settings panel to the AI Configuration section |
+| **Configure smart folders** | Goes to the Setup phase |
+| **How does StratoSort work?** | Opens a modal explaining the 3-step flow |
+
+### How StratoSort Works Modal
+
+Clicking "How does StratoSort work?" reveals the three core steps:
+
+![How StratoSort Works](../e2e-screenshots/02_how_stratosort_works_modal.webp)
+
+1. **Discover** — Drop folders, run system scans, or watch Downloads automatically
+2. **Analyze** — Local AI reads file contents, context, and prior choices
+3. **Organize** — Approve suggestions, rename intelligently, undo instantly
+
+---
+
+## 3. Setup Phase — Smart Folders
+
+Smart Folders are the destinations the AI uses to organize your files. Each folder has a
+name, path, and description that the AI reads to decide where files belong.
+
+![Setup Phase](../e2e-screenshots/03_setup_smart_folders.webp)
+
+### Default Folder
+
+A default "Uncategorized" folder is created at `~/StratoSort/Uncategorized` for files that
+don't match any other folder.
+
+### Adding a Smart Folder
+
+Click **+ Add Folder** to open the Add Smart Folder dialog:
+
+![Add Smart Folder](../e2e-screenshots/04_add_smart_folder_dialog.webp)
+
+| Field | Description |
+|:------|:------------|
+| **Folder Name** (required) | Display name — e.g., "Invoices", "Photos", "Projects" |
+| **Target Path** (optional) | Filesystem path. Auto-fills based on name and default location |
+| **Description** | Plain-language description of what files belong here. The AI uses this to match files. |
+
+The **Generate with AI** button can auto-create a description based on the folder name.
+
+### Tips
+
+- Create folders around real outcomes: `Invoices`, `Receipts`, `Screenshots`, `Contracts`
+- Write descriptions as if telling a coworker what goes in each folder
+- You can edit or delete folders anytime
+- **Reset to Defaults** restores the default folder set
+- At least one folder is required before continuing
+
+Click **Continue to Discovery** when finished.
+
+---
+
+## 4. Discover Phase — File Analysis
+
+This phase is where you add files for AI analysis. StratoSort reads file contents, extracts
+meaning, and generates organization suggestions.
+
+![Discover Phase](../e2e-screenshots/05_discover_phase.webp)
+
+### Adding Files
+
+Two methods to add files:
+
+#### Select Files
+Opens a file picker. Navigate to any directory, select individual files or use Ctrl+A to
+select all, then confirm.
+
+![File Selection](../e2e-screenshots/08_file_selection_dialog.webp)
+
+#### Scan Folder
+Opens a folder picker. Select any directory and StratoSort automatically discovers all
+supported files within it.
+
+![Scan Folder Picker](../e2e-screenshots/31_scan_folder_picker.webp)
+
+### Analysis Progress
+
+Once files are added, AI analysis begins automatically:
+
+![Analysis In Progress](../e2e-screenshots/09_analysis_in_progress.webp)
+
+The progress bar shows:
+- **File counter** — "Analyzing X of Y" with percentage
+- **Current file** — which file is being processed
+- **Stop Analysis** button — halt processing at any time
+
+Toast notifications confirm actions:
+- "Added N new files for analysis"
+- "Starting AI analysis of N files..."
+
+### Analysis Complete
+
+When analysis finishes, a completion banner appears with:
+
+- Green status dot with "Analysis complete · 5 ready"
+- Toast notification: "Analysis complete! 5 files ready"
+- Results summary: "5 successful, 0 failed"
+- **Clear Queue** button to reset
+
+The app automatically advances to the Organize phase once analysis is done.
+
+### Naming Strategy
+
+Click **Naming Strategy** in the upper right to configure how files are renamed:
+
+![Naming Strategy](../e2e-screenshots/06_naming_strategy_modal.webp)
+
+| Setting | Options | Default |
+|:--------|:--------|:--------|
+| **Convention** | subject-date, date-subject, subject-only | subject-date |
+| **Date Format** | YYYY-MM-DD, MM-DD-YYYY, DD-MM-YYYY | YYYY-MM-DD |
+| **Case** | kebab-case, snake_case, camelCase, Title Case | kebab-case |
+| **Separator** | dash, dot, underscore, none | dash |
+
+A live **Preview** shows the resulting filename format.
+
+### Knowledge OS Panel
+
+Click **Knowledge OS** to open the semantic search and relationship panel:
+
+![Knowledge OS](../e2e-screenshots/07_knowledge_os_panel.webp)
+
+Three tabs are available:
+- **Discover** — Search your files using natural language
+- **Understand** — View document summaries and extracted concepts
+- **Relate** — Explore relationships between files via the Knowledge Graph
+
+The panel requires file embeddings. Click **Build File Embeddings** to generate the vector
+index from your analysis history.
+
+---
+
+## 5. Organize Phase — Review & Execute
+
+After analysis, the Organize phase shows AI-generated suggestions for each file. You review
+and approve where each file should be moved and what it should be renamed to.
+
+> **Note:** The Organize tab is only accessible after files have been analyzed in the
+> Discover phase. Navigation is enforced — the tab shows a count badge and a tooltip
+> explaining why it may be disabled.
+
+### File Grid with AI Suggestions
+
+![Organize Phase](../e2e-screenshots/34_organize_phase_ai_suggestions.webp)
+
+Each file card shows:
+- **Original filename** with "Ready" badge
+- **Suggested Name** — AI-generated filename following your naming convention
+- **Category** dropdown — editable destination folder
+- **Confidence level** — color-coded percentage (green = high)
+- **Details** link — view the full AI analysis
+
+Example AI suggestions from a real analysis:
+
+| Original File | Suggested Name | Confidence |
+|:-------------|:---------------|:-----------|
+| invoice-2026-0042.txt | consulting-invoice-2026-02-27.txt | 100% |
+| meeting-notes.txt | product-plan-session-notes-2026-02-27.txt | 95% |
+| onboarding-checklist.txt | onboarding-checklist-2026-02-27.txt | 100% |
+
+### Batch Operations
+
+Click **Select All** to check all files, then use:
+- **Approve Selected** — Accept AI suggestions for all selected files
+- **Bulk Edit** — Change category or name pattern for multiple files at once
+- **Deselect All** — Clear the selection
+
+### Additional Features
+
+- **Status Overview** — Summary modal showing ready/pending/conflict counts
+- **Conflict Detection** — Highlights files with duplicate destination paths
+- **Execute Organization** — Moves and renames files according to approved suggestions
+- **Undo/Redo** — Full undo history for all organization operations
+- **Processed Files** — History of already-organized files
+
+---
+
+## 6. Complete Phase — Summary
+
+After executing organization, the Complete phase shows a summary of:
+- Total files organized
+- Destination folders used
+- Any errors or conflicts encountered
+- Option to start a new session or undo recent changes
+
+---
+
+## 7. Search & Knowledge OS
+
+### Search Widget
+
+Click the **Search** button in the navigation bar to open the floating search widget:
+
+![Search Widget](../e2e-screenshots/16_search_widget.webp)
+
+The widget provides:
+- Quick explanation of Knowledge OS capabilities
+- **Open Knowledge OS** button to launch the full interface
+- Keyboard shortcut: **Ctrl+K** from anywhere in the app
+
+### Knowledge OS Full Interface
+
+After files are analyzed and embedded, Knowledge OS shows indexed content:
+
+![Knowledge OS Indexed](../e2e-screenshots/36_knowledge_os_indexed.webp)
+
+The status bar shows "1 folder · 5 files indexed" confirming embeddings are built. Search
+tips guide users on natural language queries.
+
+#### Searching for Files
+
+Type a keyword or natural language description in the search bar:
+
+**Keyword search — "invoice":**
+
+![Invoice Search](../e2e-screenshots/37_knowledge_os_search_invoice.webp)
+
+- Found "Consulting Invoice.txt" with 100% confidence
+- Tags extracted: consulting, invoice, business, consulting services, amount, due, March 15 2026
+- File preview shows full content and path
+- Action buttons: View in Graph, Ask AI, filter by Type
+
+**Natural language search — "meeting notes about product planning":**
+
+![Natural Language Search](../e2e-screenshots/38_knowledge_os_search_natural_language.webp)
+
+- Found "product_plan_session_notes.txt" with 95% confidence
+- Tags: product planning, meeting notes, action items, redesign homepage, update API docs
+- Full content preview with original file path
+- **Open File** button to launch the file directly
+
+#### Discover Tab (Default)
+- **Search bar** — Describe what you're looking for in natural language
+- **Results list** — Files ranked by semantic relevance with confidence scores
+- **File preview** — Content preview, tags, and actions on the right
+- **Status indicators** — Folder count and indexed file count
+- **View in Graph** — Visualize relationships between search results
+
+#### Understand Tab — AI Conversational Chat
+
+![Understand Tab](../e2e-screenshots/46_understand_tab_chat.webp)
+
+The Understand tab is a RAG (Retrieval-Augmented Generation) chat interface for asking
+questions about your documents in natural language.
+
+Features:
+- **New Chat** button to start a conversation
+- **Search chats** to find past conversations
+- **Chat input** — "Ask a question about your documents (e.g., 'Summarize my tax returns')..."
+- **Ctrl+Enter** to send messages
+
+When you ask a question, the AI:
+1. Searches your indexed documents for relevant sources
+2. Shows "Searching documents..." then "Found N relevant sources..."
+3. Generates a contextual answer using the matched content
+
+![AI Searching](../e2e-screenshots/47_understand_ai_searching.webp)
+![AI Found Sources](../e2e-screenshots/48_understand_ai_found_sources.webp)
+
+#### Relate Tab — Knowledge Graph Visualization
+
+![Relate Tab](../e2e-screenshots/50_relate_tab_cluster.webp)
+
+The Relate tab provides an interactive Knowledge Graph for exploring relationships between
+your documents. The interface has three panels:
+
+**Left Panel — Graph Controls:**
+- **Current graph** stats (Nodes, Links, Filters)
+- **Insights** — AI-generated organizational analysis
+- **Add to Graph** — Search and add files to the visualization
+- **Explore** / **Actions** / **Advanced** sections
+
+**Center — Graph Canvas:**
+- Interactive node-link diagram with clusters
+- **Clusters On/Off** toggle
+- Zoom (+/−) and pan controls
+- Double-click clusters to expand into individual files
+
+**Right Panel — Legend & Node Details:**
+- Node type legend: Cluster (orange), File (blue), Query (purple)
+- Connection types: Shared Tags, Same Category, Content Match, Vector Similarity
+- File category colors: Documents, Images, Audio, Spreadsheets, Code, Videos
+- Cluster confidence indicators
+
+##### Cluster Exploration
+
+![Cluster Details](../e2e-screenshots/51_relate_cluster_details.webp)
+
+Clicking a cluster shows:
+- File count and confidence level
+- **WHY THIS CLUSTER** — Common tags/themes across files
+- **WHY CONNECTED** — Per-file connection reasons (Related content, Similarity connection)
+- **Show only cluster** / **Show neighbors** buttons
+
+##### Expanded Cluster View
+
+![Cluster Expanded](../e2e-screenshots/52_relate_cluster_expanded.webp)
+
+Double-clicking a cluster expands it to show individual file nodes with relationship edges.
+The tooltip reads "4 related files. Right-click cluster to organize them."
+
+##### Graph Insights
+
+![Insights](../e2e-screenshots/53_relate_insights.webp)
+
+The Insights panel provides organizational health metrics:
+- **Topic clusters** count
+- **Bridge documents** — files connecting different topic areas
+- **Near-duplicates** — potential duplicate files detected
+- **Scattered files** — orphan files without clear grouping
+- **Organizational Health** score (A through F, with percentage)
+
+![Full Graph with Legend](../e2e-screenshots/54_relate_full_graph_legend.webp)
+
+### Building the Search Index
+
+Knowledge OS requires embeddings to function. Embeddings are generated automatically during
+analysis when "Embedding Timing" is set to "During analysis" (the default). Two manual
+rebuild options are also available:
+- **Build Folder Embeddings** — Index files in Smart Folders
+- **Build File Embeddings** — Index all analyzed files
+
+---
+
+## 8. Settings — Full Reference
+
+Click the **gear icon** (⚙) in the navigation bar to open Settings. The panel is organized
+into six collapsible sections.
+
+![Settings Panel](../e2e-screenshots/14_settings_panel_top.webp)
+
+### 8.1 AI Configuration
+
+![AI Configuration](../e2e-screenshots/19_settings_ai_config_engine.webp)
+
+#### Local AI Engine
+- **Status badge** — Shows "Ready (cpu)" or "Ready (gpu)" with model count
+- **GPU Acceleration** — Toggle between CPU-only and GPU-accelerated inference
+- **Refresh Models** / **View All Models** — Manage available GGUF model files
+
+#### Default AI Models
+- **Text Model** — The LLM used for document analysis (e.g., Qwen, Llama)
+- **Vision Model** — The model used for image analysis (e.g., LLaVA)
+- **Embedding Model** — The model used for vector search (e.g., Nomic Embed)
+
+#### Model Management
+
+![Model Management](../e2e-screenshots/20_settings_ai_model_management.webp)
+
+Download additional GGUF models by entering the exact filename from the model registry.
+
+#### Embedding Behavior
+
+![Embedding Settings](../e2e-screenshots/21_settings_embedding_maintenance.webp)
+
+| Setting | Options | Default |
+|:--------|:--------|:--------|
+| **Embedding Scope** | All analyzed files, Organized files only | All analyzed files |
+| **Embedding Timing** | During analysis, After organization | During analysis |
+| **Default Embedding Policy** | Embed locally, Skip | Embed locally |
+| **Auto-generate Chunk Embeddings** | On/Off toggle | On |
+
+**Rebuild All Embeddings** — Use after changing embedding models. Preserves analysis data
+while regenerating the search index.
+
+### 8.2 Performance
+
+![Performance Settings](../e2e-screenshots/22_settings_performance_auto_organize.webp)
+
+#### Auto-Organize
+- **Auto-organize Downloads** — Automatically analyze and organize new files in your
+  Downloads folder
+- **Smart Folder Routing** — Choose routing strategy:
+  - Auto (starts LLM-only, shifts to hybrid as embeddings build)
+  - LLM-only
+  - Embedding-first
+  - Hybrid
+
+#### Background Mode
+- **Background Mode** — Keep StratoSort running in the system tray when the window closes
+
+#### Processing Limits
+- **Concurrent Analysis** — Maximum simultaneous file analyses (default: 1)
+- **Max file sizes** — Separate limits for general files (100 MB), images (100 MB), and
+  documents (200 MB)
+
+#### Graph Retrieval
+
+![Graph Retrieval](../e2e-screenshots/23_settings_graph_retrieval.webp)
+
+- **Enable Graph Expansion** — Use relationship edges to pull related files into search
+  results
+- **Graph Expansion Weight** — Slider (0–100%) controlling how much graph neighbors
+  influence ranking (default: 20%)
+- **Graph Neighbors Limit** — Maximum neighbor files per query (default: 120)
+- **Contextual Chunk Expansion** — Use adjacent chunks for more context
+
+### 8.3 Default Locations
+
+![Default Locations](../e2e-screenshots/24_settings_default_locations.webp)
+
+- **Default Smart Folder Location** — Base path where new Smart Folders are created
+  (default: home directory)
+- **Browse** button — Select a different base path
+
+#### File Naming Defaults
+
+![Naming Defaults](../e2e-screenshots/25_settings_naming_defaults.webp)
+
+Controls how files are renamed by Download Watcher, Smart Folder Watcher, and Reanalyze All
+Files. Same options as the Naming Strategy modal in Discover.
+
+### 8.4 Application
+
+![Application Settings](../e2e-screenshots/26_settings_application.webp)
+
+#### Application Preferences
+- **Launch on Startup** — Auto-start StratoSort when you log in
+- **Software Updates** — Check for new versions with one click
+
+#### Notifications
+
+![Notification Settings](../e2e-screenshots/27_settings_notifications.webp)
+
+- **Enable Notifications** — Master toggle
+- **Display Mode:**
+  - App and system tray (Recommended)
+  - App only (in-window toasts)
+  - System tray only
+- **Notification Events:**
+  - Auto-analyzed files — Notify when smart folder/download watchers analyze files
+  - Low confidence files — Notify when confidence is below the auto-organize threshold
+
+#### Settings Backup & Restore
+
+![Backup & Restore](../e2e-screenshots/28_settings_backup_restore.webp)
+
+- **Create Backup** — Save current settings to backup history
+- **Export to File** — Export settings as a portable file
+- **Import from File** — Restore settings from an export
+- **Available Backups** — List of timestamped backups with restore and delete actions
+
+### 8.5 Analysis History
+
+![Analysis History](../e2e-screenshots/29_settings_analysis_history.webp)
+
+- **View Analysis History** — Opens a viewer showing past analysis results and statistics
+- Useful for reviewing what the AI detected and how files were categorized
+
+### 8.6 Diagnostics
+
+![Diagnostics](../e2e-screenshots/30_settings_diagnostics.webp)
+
+#### Troubleshooting Logs
+- **Open Folder** — Opens the log directory in your file manager
+- **Export Logs** — Creates a log bundle for support tickets
+
+#### Backend API Test
+- **Test All APIs** — Runs connectivity checks against all core services (LLM, vector DB,
+  file system, etc.)
+
+---
+
+## 9. Videos
+
+Five walkthrough videos were recorded from the production AppImage showing real user
+interactions:
+
+| Video | Duration | Contents |
+|:------|:---------|:---------|
+| `01_welcome_and_setup_walkthrough.mp4` | ~2 min | Welcome screen, "How it works" modal, Setup phase, Add Folder dialog, navigation to Discover |
+| `02_discover_phase_walkthrough.mp4` | ~3 min | Naming Strategy modal, Knowledge OS panel, file selection dialog, multi-file import, analysis start |
+| `03_discover_analysis_and_model_setup.mp4` | ~3 min | Model download wizard with progress, "Continue with limited AI" bypass, file scanning |
+| `04_settings_search_and_navigation.mp4` | ~3 min | Settings panel overview (6 sections), Search widget, Knowledge OS full interface, navigation states |
+| `05_settings_deep_dive_and_scan_folder.mp4` | ~12 min | All 6 settings sections expanded with every option visible, Scan Folder feature demonstration |
+| `06_organize_and_knowledge_os_demo.mp4` | ~4 min | **Working AI analysis results**, Organize phase with suggestions, Knowledge OS semantic search with real results, batch operations |
+| `07_prod_organize_and_knowledge_os.mp4` | ~3 min | Production AppImage: Organize phase, Search widget, Knowledge OS Discover tab searches |
+| `08_knowledge_os_all_tabs_complete.mp4` | ~8 min | **All Knowledge OS tabs**: Discover search, Understand (AI chat with RAG), Relate (Knowledge Graph with clusters, insights, legend) |
+
+---
+
+## Linux-Specific Notes
+
+### Running the AppImage
+
+```bash
+# Make executable
+chmod +x StratoSortCore-2.0.4-linux-x86_64.AppImage
+
+# Launch
+./StratoSortCore-2.0.4-linux-x86_64.AppImage
+```
+
+### Models Directory
+
+Models are stored in `~/.config/stratosort-core/models/`. The app creates this directory
+automatically and downloads models on first launch.
+
+### Settings Location
+
+Application settings are stored in `~/.config/StratoSort Core/settings.json`.
+
+### System Tray
+
+On Linux, Background Mode places StratoSort in the system tray. Requires a tray-compatible
+desktop environment (GNOME with AppIndicator, KDE, XFCE).
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