Initial Emacs configuration with modular dev mode

- Main configuration in init.el
  - Development tools in emacs-dev-config.el (M-x enable-dev-mode)
  - Fixed diff-hl to use VC backend
  - Added Origami code folding to dev mode
  - Fixed Magit-delta to check for delta executable
  - QML files always use qml-mode in dev mode

keybinding-reference.md

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+# Emacs Keybinding Reference
+
+## Navigation & Interface
+- `M-x` - Helm command execution
+- `C-x C-f` - Helm find files
+- `C-x b` - Helm switch buffer
+- `C-x C-b` - Helm buffer list
+- `M-y` - Helm kill ring
+- `C-c h o` - Helm occur
+- `C-h SPC` - Helm mark rings
+
+## Version Control (Magit)
+- `C-x g` - Magit status
+- `C-x M-g` - Magit dispatch
+- `C-c g` - Magit file dispatch
+- `C-c C-p` - Save commit as patch (in magit modes)
+
+## Diff Highlighting
+- `M-n` - Next diff hunk
+- `M-p` - Previous diff hunk
+- `C-c v r` - Revert hunk
+- `C-c v s` - Show diff at hunk
+- `C-c v u` - Update diff indicators
+
+## Treemacs
+- `M-0` - Select treemacs window
+- `C-x t t` - Toggle treemacs
+- `<F8>` - Toggle treemacs (alternative)
+- `C-x t d` - Select directory
+- `C-x t B` - Treemacs bookmark
+- `C-c t f` - Toggle and focus treemacs
+
+## Search
+- `C-c r` - Deadgrep (ripgrep search)
+- `C-c p` - Projectile prefix
+
+## Development
+- `C-c l` - LSP prefix
+- `C-c c` - Compile
+- `C-c q` - Quick compile and run
+- `C-c t c` - Generate C++ tags
+- `C-c t p` - Generate Python tags
+- `C-c t a` - Generate all tags
+
+## Multiple Cursors
+- `C-S-l` - Edit lines
+- `C-S-d` - Mark all like this
+- `C->` - Mark next like this
+- `C-<` - Mark previous like this
+- `C-c m n` - Skip to next
+- `C-c m p` - Skip to previous
+- `C-S-<mouse-1>` - Add cursor on click
+
+## Editor
+- `C-=` - Expand region
+- `C-<return>` - CUA rectangle mark
+
+## Markdown/Notes
+- `C-c o j` - Obsidian jump to note
+- `C-c o n` - New Obsidian note
+- `C-c o l` - Insert Obsidian link
+- `C-c o s` - Search Obsidian vault
+- `C-c C-t` - Generate markdown TOC
+- `C-c z` - Olivetti mode (distraction-free)
+
+## File Management
+- `C-c n t` - Toggle neotree
+- `C-c h` - Show dev config help
+
+## System
+- `C-x k` - Kill buffer (no confirm)
+- `C-c C-r` - Reload Emacs config
+
+## Conflicts Resolved
+- Removed `C-d` override (now uses default delete-char)
+- Helm replaces all Ivy/Counsel/Swiper bindings
+- Single interface for completion (Helm only)