Migrate from Projectile to built-in project.el and fix Org mode

Major changes:
- Replace Projectile with built-in project.el for project management
- Add comprehensive Org mode configuration with TODO keywords and org-kanban support
- Fix multiple parsing errors and keybinding conflicts

Key improvements:
- Faster startup with built-in project.el (no external dependencies)
- Better integration with Eglot LSP client
- Proper Org TODO keyword highlighting and kanban column ordering
- Fixed unbalanced parentheses in init-completion.el and init-utils.el
- Resolved keybinding conflicts (C-c d g → C-c G d, removed C-u C-c C-r)
- Updated all file paths in init-utils.el to use lisp/ subdirectory

The configuration now loads cleanly without errors and maintains backward
compatibility with most Projectile keybindings (C-c p prefix) while also
supporting the standard project.el bindings (C-x p prefix).

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

lisp/init-core.el

@@ -21,7 +21,7 @@
         diff-hl
 
         ;; File management
-        treemacs treemacs-projectile treemacs-all-the-icons
+        treemacs treemacs-all-the-icons
         neotree all-the-icons all-the-icons-dired diredfl
 
         ;; Modern completion ecosystem (replaces Helm)
@@ -34,16 +34,13 @@
         corfu           ; In-buffer completion popup
         cape            ; Completion extensions for Corfu
 
-        ;; Core project management
-        projectile
-
         ;; Markdown & Notes
         markdown-mode markdown-toc grip-mode
         obsidian olivetti
 
         ;; Search and navigation
         deadgrep ripgrep wgrep anzu
-        ibuffer-sidebar ibuffer-projectile
+        ibuffer-sidebar
 
         ;; Required for some functionality
         org dash s f ht spinner lv hydra avy