Remove legacy dev config and consolidate to Eglot-based setup

- Delete emacs-dev-config.el (650 lines of legacy lsp-mode config)
- Update emacs-dev-config-modern.el to use Company instead of Corfu
- Remove legacy config loading from init.el and init-utils.el
- Update CLAUDE.md documentation to reflect new architecture

New structure:
- init-eglot.el: LSP support (auto-enables for programming modes)
- emacs-dev-config-modern.el: Optional extras via M-x enable-dev-mode-modern
- init-completion.el: Company completion (single source of truth)

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

lisp/emacs-dev-config-modern.el

@@ -9,9 +9,7 @@
   "Flag indicating whether modern development mode is enabled.")
 
 (defvar dev-mode-modern-packages
-  '(;; Core development tools
-    eglot  ; Only needed for Emacs < 29
-    corfu corfu-terminal cape  ; Modern completion
+  '(;; Core development tools (Eglot built-in for Emacs 29+)
     consult-eglot  ; Consult integration with Eglot
     flycheck  ; Can still use alongside Flymake
     yasnippet
@@ -19,26 +17,27 @@
     multiple-cursors expand-region
     hl-todo rainbow-delimiters
     origami  ; Code folding
-    
+
     ;; Version control
     magit
     forge  ; GitHub/GitLab integration
     magit-delta  ; Better diffs if delta is installed
     treemacs-magit
-    
+
     ;; Languages
     clang-format
     qml-mode
-    
+
     ;; Debugging
     dap-mode)
-  "List of packages for modern development mode.")
+  "List of packages for modern development mode.
+Company completion is configured globally in init-completion.el.
+Eglot LSP is configured in init-eglot.el.")
 
 (defun dev-mode-modern-ensure-packages ()
   "Ensure all modern development packages are installed."
   (dolist (package dev-mode-modern-packages)
-    (unless (or (package-installed-p package)
-                (and (eq package 'eglot) (fboundp 'eglot)))  ; Eglot is built-in for Emacs 29+
+    (unless (package-installed-p package)
       (package-refresh-contents)
       (package-install package))))
 
@@ -58,15 +57,14 @@
       (define-key eglot-mode-map (kbd "C-c l s") 'consult-eglot-symbols))))
 
 (defun dev-mode-modern-setup-completion ()
-  "Setup modern completion with Corfu."
-  ;; Corfu is already configured in init-completion.el
-  ;; Add development-specific configurations here
-  (with-eval-after-load 'corfu
-    ;; More aggressive completion in programming modes
-    (add-hook 'prog-mode-hook
-              (lambda ()
-                (setq-local corfu-auto-delay 0.1)
-                (setq-local corfu-auto-prefix 1)))))
+  "Setup completion for development.
+Company is configured globally in init-completion.el.
+This function adds development-specific tweaks."
+  ;; More aggressive completion in programming modes
+  (add-hook 'prog-mode-hook
+            (lambda ()
+              (setq-local company-idle-delay 0.1)
+              (setq-local company-minimum-prefix-length 1))))
 
 (defun dev-mode-modern-setup-yasnippet ()
   "Configure yasnippet for code snippets."