Add pre-commit hooks mirroring CI (shellcheck + JSON + formatting)

- .pre-commit-config.yaml: shellcheck, check-json, end-of-file-fixer,
  trailing-whitespace — excludes macOS/ (zsh scripts unsupported)
- CI lint.yml: exclude macOS/ from shellcheck to match
- Fix missing trailing newlines in macOS/zshrc.example and bookmarks.yaml

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: ulises-c

.github/workflows/lint.yml

@@ -16,6 +16,7 @@ jobs:
         with:
           scandir: .
           severity: warning
+          ignore_paths: macOS
 
   json-validate:
     runs-on: ubuntu-latest

.pre-commit-config.yaml

@@ -0,0 +1,14 @@
+repos:
+  - repo: https://github.com/shellcheck-py/shellcheck-py
+    rev: v0.10.0.1
+    hooks:
+      - id: shellcheck
+        args: [--severity=warning]
+        exclude: ^macOS/
+
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v5.0.0
+    hooks:
+      - id: check-json
+      - id: end-of-file-fixer
+      - id: trailing-whitespace

linux-server/homepage/config/bookmarks.yaml

@@ -1 +0,0 @@
-

macOS/zshrc.example

@@ -120,4 +120,4 @@ export PATH="$PATH:/Users/ulises/.local/bin"
 
 # zsh auto suggestions & syntax highlighting (installed via Homebrew)
 source $(brew --prefix)/share/zsh-autosuggestions/zsh-autosuggestions.zsh
-source $(brew --prefix)/share/zsh-syntax-highlighting/zsh-syntax-highlighting.zsh
+source $(brew --prefix)/share/zsh-syntax-highlighting/zsh-syntax-highlighting.zsh